Observation in the natural sciences is an act or instance of noticing or perceiving and the acquisition of information from a primary source . In living beings, observation employs the senses . In science , observation can also involve the perception and recording of data via the use of scientific instruments . The term may also refer to any data collected during the scientific activity. Observations can be qualitative , that is, the absence or presence of a property is noted and the observed phenomenon described, or quantitative if a numerical value is attached to the observed phenomenon by counting or measuring .
64-575: No Béarla is a four-part documentary style programme broadcast on Irish language television channel TG4 and produced by Dearg Films RTÉ/TG4. It follows presenter Manchán Magan as he journeys throughout Ireland attempting to show that Irish is spoken only by a minority of the population. The title is derived from the English negative "No" and the Irish word for the English language , Béarla . The theme tune
128-584: A Metropolis (dir. Walter Ruttmann , 1927); Man with a Movie Camera (dir. Dziga Vertov , 1929); Douro, Faina Fluvial (dir. Manoel de Oliveira , 1931); and Rhapsody in Two Languages (dir. Gordon Sparling , 1934). A city symphony film, as the name suggests, is most often based around a major metropolitan city area and seeks to capture the life, events and activities of the city. It can use abstract cinematography (Walter Ruttman's Berlin ) or may use Soviet montage theory (Dziga Vertov's, Man with
192-421: A Movie Camera ). Most importantly, a city symphony film is a form of cinepoetry , shot and edited in the style of a " symphony ". The European continental tradition ( See: Realism ) focused on humans within human-made environments, and included the so-called city symphony films such as Walter Ruttmann's, Berlin: Symphony of a Metropolis (of which Grierson noted in an article that Berlin, represented what
256-429: A Summer ( Jean Rouch ), Dont Look Back ( D. A. Pennebaker ), Grey Gardens ( Albert and David Maysles ), Titicut Follies ( Frederick Wiseman ), Primary and Crisis: Behind a Presidential Commitment (both produced by Robert Drew ), Harlan County, USA (directed by Barbara Kopple ), Lonely Boy ( Wolf Koenig and Roman Kroitor ) are all frequently deemed cinéma vérité films. The fundamentals of
320-520: A broader perspective, as a reaction against studio-based film production constraints. Shooting on location, with smaller crews, would also happen in the French New Wave , the filmmakers taking advantage of advances in technology allowing smaller, handheld cameras and synchronized sound to film events on location as they unfolded. Although the terms are sometimes used interchangeably, there are important differences between cinéma vérité ( Jean Rouch ) and
384-622: A documentary should not be); Alberto Cavalcanti's, Rien que les heures; and Dziga Vertov's Man with a Movie Camera . These films tend to feature people as products of their environment, and lean towards the avant-garde. Dziga Vertov was central to the Soviet Kino-Pravda (literally, "cinematic truth") newsreel series of the 1920s. Vertov believed the camera – with its varied lenses, shot-counter shot editing, time-lapse, ability to slow motion, stop motion and fast-motion – could render reality more accurately than
448-437: A form of journalism, advocacy, or personal expression. Early film (pre-1900) was dominated by the novelty of showing an event. Single-shot moments were captured on film, such as a train entering a station, a boat docking, or factory workers leaving work. These short films were called "actuality" films; the term "documentary" was not coined until 1926. Many of the first films, such as those made by Auguste and Louis Lumière , were
512-470: A helpful assistant. He then visits a pharmacy to buy condoms or coiscíní and goes out to a nightclub in a bid to "get lucky". After many unsuccessful attempts at asking girls to dance with him, he finally finds an Irish-speaking lady who is happy to oblige. Later that night, he calls a phone sex line, but the operator hangs up, not understanding him. Later in Galway, he tries his hand at busking and, singing
576-511: A major battle and re-enact scenes to film them. The propagandist tradition consists of films made with the explicit purpose of persuading an audience of a point. One of the most celebrated and controversial propaganda films is Leni Riefenstahl 's film Triumph of the Will (1935), which chronicled the 1934 Nazi Party Congress and was commissioned by Adolf Hitler . Leftist filmmakers Joris Ivens and Henri Storck directed Borinage (1931) about
640-437: A minute or less in length, due to technological limitations. Examples can be viewed on YouTube. Films showing many people (for example, leaving a factory) were often made for commercial reasons: the people being filmed were eager to see, for payment, the film showing them. One notable film clocked in at over an hour and a half, The Corbett-Fitzsimmons Fight . Using pioneering film-looping technology, Enoch J. Rector presented
704-501: A more poetic aesthetic approach to documentary. Examples of their work include Drifters (John Grierson), Song of Ceylon (Basil Wright), Fires Were Started , and A Diary for Timothy (Humphrey Jennings). Their work involved poets such as W. H. Auden , composers such as Benjamin Britten , and writers such as J. B. Priestley . Among the best known films of the movement are Night Mail and Coal Face . Calling Mr. Smith (1943)
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#1733094002933768-577: A new art form; that the "original" actor and "original" scene are better guides than their fiction counterparts for interpreting the modern world; and that materials "thus taken from the raw" can be more real than the acted article. In this regard, Grierson's definition of documentary as "creative treatment of actuality" has gained some acceptance; however, this position is at variance with Soviet film-maker Dziga Vertov 's credos of provocation to present "life as it is" (that is, life filmed surreptitiously), and "life caught unawares" (life provoked or surprised by
832-538: A physical process itself, all forms of observation (human or instrumental) involve amplification and are thus thermodynamically irreversible processes , increasing entropy . In some specific fields of science, the results of observation differ depending on factors that are not important in everyday observation. These are usually illustrated with apparent " paradoxes " in which an event appears different when observed from two different points of view, seeming to violate "common sense". The human senses do not function like
896-428: A resource to teach various principles . Documentary filmmakers have a responsibility to be truthful to their vision of the world without intentionally misrepresenting a topic. Social media platforms (such as YouTube ) have provided an avenue for the growth of the documentary- film genre . These platforms have increased the distribution area and ease-of-accessibility. Polish writer and filmmaker Bolesław Matuszewski
960-477: A souvenir shop (the first being Mícheál Ó Muircheartaigh , who walked by and said a few words). At the conclusion Manchán visits the grave of Peig Sayers and reads one of her passages aloud. The second series comprised a total of four episodes and aired on TG4 on Fridays at 19:30, beginning on 28 March 2008 and finishing on 18 April 2008. It was repeated on the following Sunday of each week at 20:00. Documentary film A documentary film or documentary
1024-434: A video camcorder , impartially recording all observations. Human perception occurs by a complex, unconscious process of abstraction , in which certain details of the incoming sense data are noticed and remembered, and the rest is forgotten. What is kept and what is thrown away depends on an internal model or representation of the world, called by psychologists a schema , that is built up over our entire lives. The data
1088-503: A wordless meditation on wartime Britain. From 1982, the Qatsi trilogy and the similar Baraka could be described as visual tone poems, with music related to the images, but no spoken content. Koyaanisqatsi (part of the Qatsi trilogy ) consists primarily of slow motion and time-lapse photography of cities and many natural landscapes across the United States. Baraka tries to capture
1152-414: Is " Boulevard of Broken Dreams " by Green Day . The first series was originally broadcast on Sunday nights between 21:30 and 22:00, and repeated on Wednesday evenings between 19:30 and 20:00. It aired from 7 January until 28 January 2007. The second series was first broadcast on Fridays at 19:30, beginning on 28 March 2008. Manchan travels to Dublin , and his starting point in his search for Irish speakers
1216-588: Is a map shop there. In which Manchán travels to Dundalk and Belfast . When his car breaks down whilst leaving Dundalk, he finds he cannot find a mechanic as directory enquiry services simply laugh at him. Whilst in Belfast, Manchán attempts to find an Irish speaker on the Falls Road . In which Manchán travels to Letterkenny and Galway . In Letterkenny, Manchán decides to try something he has never done before – bowling – and heads to Arena 7 , where he encounters
1280-683: Is a non-fictional motion picture intended to "document reality, primarily for instruction, education or maintaining a historical record ". Bill Nichols has characterized the documentary in terms of "a filmmaking practice, a cinematic tradition, and mode of audience reception [that remains] a practice without clear boundaries". Early documentary films, originally called " actuality films ", briefly lasted for one minute or less. Over time, documentaries have evolved to become longer in length and to include more categories. Some examples are educational , observational and docufiction . Documentaries are very informative , and are often used within schools as
1344-470: Is a separate area. Pathé was the best-known global manufacturer of such films in the early 20th century. A vivid example is Moscow Clad in Snow (1909). Biographical documentaries appeared during this time, such as the feature Eminescu-Veronica-Creangă (1914) on the relationship between the writers Mihai Eminescu , Veronica Micle and Ion Creangă (all deceased at the time of the production), released by
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#17330940029331408-419: Is an anti-Nazi color film created by Stefan Themerson which is both a documentary and an avant-garde film against war. It was one of the first anti-Nazi films in history. Cinéma vérité (or the closely related direct cinema ) was dependent on some technical advances to exist: light, quiet and reliable cameras, and portable sync sound. Cinéma vérité and similar documentary traditions can thus be seen, in
1472-476: Is fitted into this schema. Later when events are remembered, memory gaps may even be filled by "plausible" data the mind makes up to fit the model; this is called reconstructive memory . How much attention the various perceived data are given depends on an internal value system, which judges how important it is to the individual. Thus two people can view the same event and come away with entirely different perceptions of it, even disagreeing about simple facts. This
1536-479: Is that the observation may affect the process being observed, resulting in a different outcome than if the process was unobserved. This is called the observer effect . For example, it is not normally possible to check the air pressure in an automobile tire without letting out some of the air, thereby changing the pressure. However, in most fields of science, it is possible to reduce the effects of observation to insignificance by using better instruments. Considered as
1600-461: Is the discovery of new phenomena, this bias can and has caused new discoveries to be overlooked; one example is the discovery of x-rays . It can also result in erroneous scientific support for widely held cultural myths, on the other hand, as in the scientific racism that supported ideas of racial superiority in the early 20th century. Correct scientific technique emphasizes careful recording of observations, separating experimental observations from
1664-415: Is why eyewitness testimony is notoriously unreliable. Several of the more important ways observations can be affected by human psychology are given below. Human observations are biased toward confirming the observer's conscious and unconscious expectations and view of the world; we " see what we expect to see ". In psychology, this is called confirmation bias . Since the object of scientific research
1728-660: The Bucharest chapter of Pathé . Early color motion picture processes such as Kinemacolor (known for the feature With Our King and Queen Through India (1912)) and Prizma Color (known for Everywhere With Prizma (1919) and the five-reel feature Bali the Unknown (1921)) used travelogues to promote the new color processes. In contrast, Technicolor concentrated primarily on getting their process adopted by Hollywood studios for fiction feature films. Also during this period, Frank Hurley 's feature documentary film, South (1919) about
1792-582: The English Market and, out on the streets, he meets RTÉ 's John Creedon , an Irish speaker. He also attempts to get his hair cut but needs help from a fellow customer when the female barber, who was educated in Tennessee in the United States and has never spoken Irish, does not understand him. Whilst in Killarney, he successfully hires a bicycle and discovers he is only the second person to have spoken Irish in
1856-644: The Imperial Trans-Antarctic Expedition was released. The film documented the failed Antarctic expedition led by Ernest Shackleton in 1914. With Robert J. Flaherty 's Nanook of the North in 1922, documentary film embraced romanticism . Flaherty filmed a number of heavily staged romantic documentary films during this time period, often showing how his subjects would have lived 100 years earlier and not how they lived right then. For instance, in Nanook of
1920-884: The 1920s and 1930s. These films were particularly influenced by modern art , namely Cubism , Constructivism , and Impressionism . According to art historian and author Scott MacDonald , city symphony films can be described as, "An intersection between documentary and avant-garde film: an avant-doc "; however, A.L. Rees suggests regarding them as avant-garde films. Early titles produced within this genre include: Manhatta (New York; dir. Paul Strand , 1921); Rien que les heures /Nothing But The Hours ( France ; dir. Alberto Cavalcanti , 1926); Twenty Four Dollar Island (dir. Robert J. Flaherty , 1927); Moscow (dir. Mikhail Kaufman , 1927); Études sur Paris (dir. André Sauvage , 1928); The Bridge (1928) and Rain (1929), both by Joris Ivens ; São Paulo, Sinfonia da Metrópole (dir. Adalberto Kemeny , 1929), Berlin: Symphony of
1984-544: The Belgian coal mining region. Luis Buñuel directed a " surrealist " documentary Las Hurdes (1933). Pare Lorentz 's The Plow That Broke the Plains (1936) and The River (1938) and Willard Van Dyke 's The City (1939) are notable New Deal productions, each presenting complex combinations of social and ecological awareness, government propaganda, and leftist viewpoints. Frank Capra 's Why We Fight (1942–1944) series
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2048-780: The Furnaces , from 1968), directed by Octavio Getino and Fernando Solanas , influenced a whole generation of filmmakers. Among the many political documentaries produced in the early 1970s was "Chile: A Special Report", public television's first in-depth expository look at the September 1973 overthrow of the Salvador Allende government in Chile by military leaders under Augusto Pinochet , produced by documentarians Ari Martinez and José Garcia. A June 2020 article in The New York Times reviewed
2112-574: The North , Flaherty did not allow his subjects to shoot a walrus with a nearby shotgun, but had them use a harpoon instead. Some of Flaherty's staging, such as building a roofless igloo for interior shots, was done to accommodate the filming technology of the time. Paramount Pictures tried to repeat the success of Flaherty's Nanook and Moana with two romanticized documentaries, Grass (1925) and Chang (1927), both directed by Merian C. Cooper and Ernest Schoedsack . The " city symphony " sub film genre consisted of avant-garde films during
2176-673: The North American " direct cinema " (or more accurately " cinéma direct "), pioneered by, among others, Canadians Michel Brault , Pierre Perrault and Allan King , and Americans Robert Drew , Richard Leacock , Frederick Wiseman and Albert and David Maysles . The directors of the movement take different viewpoints on their degree of involvement with their subjects. Kopple and Pennebaker, for instance, choose non-involvement (or at least no overt involvement), and Perrault, Rouch, Koenig, and Kroitor favor direct involvement or even provocation when they deem it necessary. The films Chronicle of
2240-460: The Penguins , and An Inconvenient Truth among the most prominent examples. Compared to dramatic narrative films, documentaries typically have far lower budgets which makes them attractive to film companies because even a limited theatrical release can be highly profitable. The nature of documentary films has expanded in the past 30 years from the cinéma vérité style introduced in the 1960s in which
2304-571: The Romanian professor Gheorghe Marinescu made several science films in his neurology clinic in Bucharest : Walking Troubles of Organic Hemiplegy (1898), The Walking Troubles of Organic Paraplegies (1899), A Case of Hysteric Hemiplegy Healed Through Hypnosis (1899), The Walking Troubles of Progressive Locomotion Ataxy (1900), and Illnesses of the Muscles (1901). All these short films have been preserved. The professor called his works "studies with
2368-485: The advantage of documentaries lies in introducing new perspectives which may not be prevalent in traditional media such as written publications and school curricula. Documentary practice is the complex process of creating documentary projects. It refers to what people do with media devices, content, form, and production strategies to address the creative, ethical, and conceptual problems and choices that arise as they make documentaries. Documentary filmmaking can be used as
2432-474: The camera). The American film critic Pare Lorentz defines a documentary film as "a factual film which is dramatic." Others further state that a documentary stands out from the other types of non-fiction films for providing an opinion, and a specific message, along with the facts it presents. Scholar Betsy McLane asserted that documentaries are for filmmakers to convey their views about historical events, people, and places which they find significant. Therefore,
2496-601: The conclusions drawn from them, and techniques such as blind or double blind experiments , to minimize observational bias. Modern scientific instruments can extensively process "observations" before they are presented to the human senses, and particularly with computerized instruments, there is sometimes a question as to where in the data processing chain "observing" ends and "drawing conclusions" begins. This has recently become an issue with digitally enhanced images published as experimental data in papers in scientific journals . The images are enhanced to bring out features that
2560-492: The creation of a Film Archive to collect and keep safe visual materials. The word "documentary" was coined by Scottish documentary filmmaker John Grierson in his review of Robert Flaherty 's film Moana (1926), published in the New York Sun on 8 February 1926, written by "The Moviegoer" (a pen name for Grierson). Grierson's principles of documentary were that cinema's potential for observing life could be exploited in
2624-429: The development of "reality television" that occasionally verges on the documentary but more often veers to the fictional or staged. The "making-of" documentary shows how a movie or a computer game was produced. Usually made for promotional purposes, it is closer to an advertisement than a classic documentary. Modern lightweight digital video cameras and computer-based editing have greatly aided documentary makers, as has
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2688-407: The director. The commercial success of these documentaries may derive from this narrative shift in the documentary form, leading some critics to question whether such films can truly be called documentaries; critics sometimes refer to these works as " mondo films " or "docu-ganda." However, directorial manipulation of documentary subjects has been noted since the work of Flaherty, and may be endemic to
2752-448: The dramatic drop in equipment prices. The first film to take full advantage of this change was Martin Kunert and Eric Manes ' Voices of Iraq , where 150 DV cameras were sent to Iraq during the war and passed out to Iraqis to record themselves. Films in the documentary form without words have been made. Listen to Britain , directed by Humphrey Jennings and Stuart McAllister in 1942, is
2816-526: The early part of the 20th century. They were often referred to by distributors as "scenics". Scenics were among the most popular sort of films at the time. An important early film which moved beyond the concept of the scenic was In the Land of the Head Hunters (1914), which embraced primitivism and exoticism in a staged story presented as truthful re-enactments of the life of Native Americans . Contemplation
2880-519: The entirety of a famous 1897 prize-fight on cinema screens across the United States. In May 1896, Bolesław Matuszewski recorded on film a few surgical operations in Warsaw and Saint Petersburg hospitals. In 1898, French surgeon Eugène-Louis Doyen invited Matuszewski and Clément Maurice to record his surgical operations. They started in Paris a series of surgical films sometime before July 1898. Until 1906,
2944-513: The films was so vital that they were often given co-director credits. Famous cinéma vérité/direct cinema films include Les Raquetteurs , Showman , Salesman , Near Death , and The Children Were Watching . In the 1960s and 1970s, documentary film was often regarded as a political weapon against neocolonialism and capitalism in general, especially in Latin America, but also in a changing society. La Hora de los hornos ( The Hour of
3008-547: The filthiest, most debauched lyrics he can think of to see if anyone will understand, old ladies smile and tap their feet merrily as he serenades them with filth. In which Manchán travels to Cork and Killarney . Manchán gets lost in the Crawford Art Gallery in Cork, while in Killarney he hunts for souvenirs and tests local knowledge of Irish by trying to recruit accomplices for a bank robbery. In Cork, Manchán first visits
3072-533: The form due to problematic ontological foundations. Documentary filmmakers are increasingly using social impact campaigns with their films. Social impact campaigns seek to leverage media projects by converting public awareness of social issues and causes into engagement and action, largely by offering the audience a way to get involved. Examples of such documentaries include Kony 2012 , Salam Neighbor , Gasland , Living on One Dollar , and Girl Rising . Although documentaries are financially more viable with
3136-427: The great pulse of humanity as it flocks and swarms in daily activity and religious ceremonies. Bodysong was made in 2003 and won a British Independent Film Award for "Best British Documentary." Observation The scientific method requires observations of natural phenomena to formulate and test hypotheses . It consists of the following steps: Observations play a role in the second and fifth steps of
3200-694: The help of the cinematograph," and published the results, along with several consecutive frames, in issues of La Semaine Médicale magazine from Paris, between 1899 and 1902. In 1924, Auguste Lumière recognized the merits of Marinescu's science films: "I've seen your scientific reports about the usage of the cinematograph in studies of nervous illnesses, when I was still receiving La Semaine Médicale , but back then I had other concerns, which left me no spare time to begin biological studies. I must say I forgot those works and I am thankful to you that you reminded them to me. Unfortunately, not many scientists have followed your way." Travelogue films were very popular in
3264-428: The human eye, and created a film philosophy from it. The newsreel tradition is important in documentary film. Newsreels at this time were sometimes staged but were usually re-enactments of events that had already happened, not attempts to steer events as they were in the process of happening. For instance, much of the battle footage from the early 20th century was staged; the cameramen would usually arrive on site after
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#17330940029333328-468: The increasing popularity of the genre and the advent of the DVD, funding for documentary film production remains elusive. Within the past decade, the largest exhibition opportunities have emerged from within the broadcast market, making filmmakers beholden to the tastes and influences of the broadcasters who have become their largest funding source. Modern documentaries have some overlap with television forms, with
3392-656: The landmark 14-hour Eyes on the Prize : America's Civil Rights Years (1986 – Part 1 and 1989 – Part 2) by Henry Hampton, 4 Little Girls (1997) by Spike Lee , The Civil War by Ken Burns , and UNESCO-awarded independent film on slavery 500 Years Later , express not only a distinctive voice but also a perspective and point of views. Some films such as The Thin Blue Line by Errol Morris incorporate stylized re-enactments, and Michael Moore 's Roger & Me place far more interpretive control with
3456-416: The phenomenon being observed to a standard unit . The standard unit can be an artifact, process, or definition which can be duplicated or shared by all observers. In measurement, the number of standard units which is equal to the observation is counted. Measurement reduces an observation to a number that can be recorded, and two observations which result in the same number are equal within the resolution of
3520-513: The political documentary And She Could Be Next , directed by Grace Lee and Marjan Safinia. The Times described the documentary not only as focusing on women in politics, but more specifically on women of color, their communities, and the significant changes they have wrought upon America. Box office analysts have noted that the documentary film genre has become increasingly successful in theatrical release with films such as Fahrenheit 9/11 , Super Size Me , Food, Inc. , Earth , March of
3584-594: The process. Human senses are limited and subject to errors in perception, such as optical illusions . Scientific instruments were developed to aid human abilities of observation, such as weighing scales , clocks , telescopes , microscopes , thermometers , cameras , and tape recorders , and also translate into perceptible form events that are unobservable by the senses, such as indicator dyes , voltmeters , spectrometers , infrared cameras , oscilloscopes , interferometers , Geiger counters , and radio receivers . One problem encountered throughout scientific fields
3648-503: The researcher wants to emphasize, but this also has the effect of supporting the researcher's conclusions. This is a form of bias that is difficult to quantify. Some scientific journals have begun to set detailed standards for what types of image processing are allowed in research results. Computerized instruments often keep a copy of the "raw data" from sensors before processing, which is the ultimate defense against processing bias, and similarly, scientific standards require preservation of
3712-440: The scientific method. However, the need for reproducibility requires that observations by different observers can be comparable. Human sense impressions are subjective and qualitative , making them difficult to record or compare. The use of measurement was developed to allow recording and comparison of observations made at different times and places, by different people. The measurement consists of using observation to compare
3776-530: The style include following a person during a crisis with a moving, often handheld, camera to capture more personal reactions. There are no sit-down interviews, and the shooting ratio (the amount of film shot to the finished product) is very high, often reaching 80 to one. From there, editors find and sculpt the work into a film. The editors of the movement – such as Werner Nold , Charlotte Zwerin , Muffie Meyer , Susan Froemke , and Ellen Hovde – are often overlooked, but their input to
3840-432: The use of portable camera and sound equipment allowed an intimate relationship between filmmaker and subject. The line blurs between documentary and narrative and some works are very personal, such as Marlon Riggs 's Tongues Untied (1989) and Black Is...Black Ain't (1995), which mix expressive, poetic, and rhetorical elements and stresses subjectivities rather than historical materials. Historical documentaries, such as
3904-494: The year of his last film, Doyen recorded more than 60 operations. Doyen said that his first films taught him how to correct professional errors he had been unaware of. For scientific purposes, after 1906, Doyen combined 15 of his films into three compilations, two of which survive, the six-film series Extirpation des tumeurs encapsulées (1906), and the four-film Les Opérations sur la cavité crânienne (1911). These and five other of Doyen's films survive. Between July 1898 and 1901,
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#17330940029333968-661: Was a newsreel series in the United States, commissioned by the government to convince the U.S. public that it was time to go to war. Constance Bennett and her husband Henri de la Falaise produced two feature-length documentaries, Legong: Dance of the Virgins (1935) filmed in Bali , and Kilou the Killer Tiger (1936) filmed in Indochina . In Canada, the Film Board , set up by John Grierson,
4032-475: Was among those who identified the mode of documentary film. He wrote two of the earliest texts on cinema, Une nouvelle source de l'histoire ("A New Source of History") and La photographie animée ("Animated photography"). Both were published in 1898 in French and were among the earliest written works to consider the historical and documentary value of the film. Matuszewski is also among the first filmmakers to propose
4096-599: Was set up for the same propaganda reasons. It also created newsreels that were seen by their national governments as legitimate counter-propaganda to the psychological warfare of Nazi Germany orchestrated by Joseph Goebbels . In Britain, a number of different filmmakers came together under John Grierson. They became known as the Documentary Film Movement . Grierson, Alberto Cavalcanti , Harry Watt , Basil Wright , and Humphrey Jennings amongst others succeeded in blending propaganda, information, and education with
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