The camera obscura is an optical device that projects an image of its surroundings on a screen. It is primarily used in drawing and painting, and was one of the inventions that led to photography. The device consists of a box or room with a small pin hole or sometimes a lens on one side. Light from an external scene passes through the hole or lens and strikes a surface inside where it is reproduced, upside-down, but with color and perspective preserved. The image can be projected onto paper, and can then be traced to produce a highly accurate representation.
The Dutch master artist Johannes Vermeer, is known to have used a camera obscura. The movie "The girl with the pearl earring," portrays Vermeer durring the peak of his career. In the movie Vermeer describes the uses of the camera obscura and you get to see him use it while he paints.
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