![]() Mozi correctly asserted that the camera obscura image is inverted because light travels in straight lines. The oldest known record of this principle is a description by Han Chinese philosopher Mozi (ca. Camera obscura ( Latin for "dark room") is the natural optical phenomenon that occurs when an image of a scene at the other side of a screen (or for instance a wall) is projected through a small hole in that screen to form an inverted image (left to right and upside down) on a surface opposite to the opening. Projectors share a common history with cameras in the camera obscura. Main articles: Camera obscura and Pinhole camera Joseph Needham sums up some possible projection examples from China in his 1962 book series Science and Civilization in China Prehistory to 1100 Shadow play Projections were often presented or perceived as magic or even as religious experiences, with most projectionists unwilling to share their secrets. Many did not understand the nature of what they had seen and few had ever seen other comparable media. Spectators did not always provide the details needed to differentiate between for instance a shadow play and a lantern projection. There probably existed quite a few other types of projectors than the examples described below, but evidence is scarce and reports are often unclear about their nature. Revolving lanterns (see below for details).Mini portable home theatres projector. ![]() ![]()
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