Purkinge's FiguresIn optics, figures produced on a wall of uniform colour when a person entering a dark room with a candle moves it up and down approximately on a level with the eyes. From the eye near the candle an image of the retinal vessels will appear projected on the wall. Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Purkinge's Figures from Infoplease:
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