void mode

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A manner of viewing a coloured surface through a small aperture so that only a small and isolated area of the surface is visible at one time. Under these conditions the Land effect disappears, and some non-spectral colours such as brown cannot be perceived at all, the appearance of brown arising only when a yellow surface is darker than its surround. See also retinex theory. Compare anorthoscopic, reduction screen.

Subjects: Psychology.

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