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Similarly, if the eye were in perfect condition, but the visual centers of the brain were defective, one could not "see". Perhaps it is more correct to speak of a system of components necessary for visual experience, but, even if so, it is well to understand that what impinges upon the eyes are not visual realities but electromagnetic radiations. Further, what one sees is a function not simply of what exists in the external world, but of a number of other factors as well, for example, what one has familiarly seen before, what one expects to see, what others claim is there to be seen, what one wants to see, the physical condition of the organism, its conditioning and socialization, the conceptual and linguistic categories available to the organism, and so on. It is thus not unusual that, in a desert situation, a calm, normal person may, misinterpreting physical cues, make an oasis, complete with buildings and trees, out of energies reflected over a heated surface from rock and brush. There is nothing unusual in this sort of thing. But this did not seem to me a mirage sort of experience. I rubbed my eyes. - (Tribesmen of Gor, Chapter )