Abstract

John Locke:When we set before our eyes a round globe of uniform colour, v.g. gold, alabaster or jet, it is certain that the idea thereby imprinted in our mind is of a flat circle, variously shadowed, with several degrees of light and brightness coming to our eyes. But we having, by use, been accustomed to perceive what kind of appearance convex bodies are wont to make in us, what alterations are made in the reflections of light by the difference of the sensible figures of bodies: the judgment presently, by an habitual custom, alters the appearances into their causes.H.H. Price:…. a distant hillside which is full of protuberances, and slopes upwards at quite a gentle angle, will appear flat and vertical….. This means that the sense-datum, the colour expanse which we sense, actually is flat and vertical.