ABSTRACT
Obviously, in some sense the existence of visual space, and its genuinely spatial character, can hardly be doubted . You have merely to look around: surely being in a space is what vision feels like; or you can read the literature and find that mathematical models of visual space take it for granted. Although the spatial character of "visual space" has a compelling basis in experience, and is naturally embodied in geometrically formulated perceptual theories, it is not so obvious how (or whether) it can be objectively demonstrated or put to experimental test.
