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  2. Overhead projector - Wikipedia

    en.wikipedia.org/wiki/Overhead_projector

    Overhead projector in operation during a classroom lesson. An overhead projector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience.

  3. Liquid light show - Wikipedia

    en.wikipedia.org/wiki/Liquid_light_show

    Light from a liquid light show, being projected behind a guitarist Layers of colored mineral oil and alcohol move over the projector lens and produce changing color patterns. Liquid light shows (or psychedelic light shows ) [ not verified in body ] are a form of light art that surfaced in the early 1960s as accompaniment to electronic music and ...

  4. Projector - Wikipedia

    en.wikipedia.org/wiki/Projector

    In the late 1950s and early 1960s, overhead projectors began to be widely used in schools and businesses. The first overhead projector was used for police identification work. [citation needed] It used a celluloid roll over a 9-inch stage allowing facial characteristics to be rolled across the stage. The United States military in 1940 was the ...

  5. After all, without floor lamps, the only source of light in a room is the recessed or boob lights on the ceiling, which are definitely more functional than fashionable. Floor lamps, though, offer ...

  6. Gaffer (occupation) - Wikipedia

    en.wikipedia.org/wiki/Gaffer_(occupation)

    There are several possible explanations for the history of the term gaffer.. One possibility is that the term originally referred to the moving of overhead equipment, or before electricity and in Shakespeare-era play theatres, lighting louvres to control lighting levels using a long pole with a wide grappling hook on its end, called a gaff.

  7. Photographic lighting - Wikipedia

    en.wikipedia.org/wiki/Photographic_lighting

    Photographic lighting refers to how a light source, artificial or natural, illuminates the scene or subject that is photographed; put simply, it is lighting in regards to photography. Photographers can manipulate the positioning and the quality of a light source to create visual effects , potentially changing aspects of the photograph such as ...

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