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Perspective and Illusion

42 43 makIng sense oF The lIghT centres, curves, and edges Many people assume that their eyes resemble cameras, projecting the world into their heads for them to watch. The truth is, of course, much stranger, for what inner eyes could be watching anyway Human eyes are much more complex than cameras. If you hold red and blue balls out at 90o to your side you can see them but not tell their colours apart, as your peripheral vision is specialised for spotting motion, not colour. Your central vision, by contrast, is specialised for fine detail and colour try reading something you are not looking at. Centresurround arrays of photoreceptors shown opposite only fire when unbalanced by an edge or point of light crossing them. These have their colour counterparts too, and combine to build curved edges and areas. As we turn our heads or move our eyes the world stays remarkably stable outside us. Wear a pair of inverting spectacles that turn the world upside down, and lo after a few days your brain will turn it the right way up again until you take the glasses off. Our minds even kindly fill our blind spots with informed fiction lowest opposite. The world is an informed hypothesis. Above Noticing your blind spot close your left eye and look at the white dot, bringing the book closer and closer until the white cross vanishes.
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