For I imagine, anyone will easily grant, that it would be impertinent to suppose the ideas of colours innate in a creature to whom God hath given sight, and a power to receive them by the eyes from external objects: and no less unreasonable would it be to attribute several truths to the impressions of nature and innate characters, when we may observe in ourselves faculties fir to attain as easy and certain knowledge of them as if they were originally imprinted an the mind.

John Locke: An Essay concerning Human Understanding, Book I, Chapter II, § 1.

Pictures: Péter Szijj, concept: Ferenc Szijj (to the memory of Kristóf J. Nyíri's lecture given on December 18th 1997 in C3, on the presentation of Experimental document).