invariant with regard to variations and varieties. Starting from a certain red, for example, one can vary, if only in imagination, its brightness; one can even vary its shade or hue while taking care that all the resulting variations remain red." /> On a perceptual root of abstraction - Gurwitsch Aron | sdvig press

On a perceptual root of abstraction

Aron Gurwitsch

pp. 433-438


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