“A complete theory would have to answer, among others, the following questions, given two adjoining retinal areas of different stimulation, under what conditions will the corresponding parts of the behavioural (perceptual) field appear of different whiteness but equal brightness (or "illumination"), when of different brightness but equal whiteness? A complete answer to this question would probably supply the key to the complete theory of colour perception in the broadest sense.”

—  Kurt Koffka

Source: Principles of Gestalt Psychology, 1935, p. 260

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Kurt Koffka 12
German psychologist 1886–1941

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