![]() No, like the first optical illusion we saw in our list, this is not a GIF but a still image – though the wheels appear to turn in front of your eyes. This is an illusion, featured in Clive Gifford's book Eye Benders, and inspired by experimental psychologist Akiyoshi Kitaoka. Your head might be spinning (Image credit: Cliver Gifford via The Guardian) There are also accidental optical illusions caused by things like atmospheric phenomena and the similarities or the position of an object at a particular moment (see the floating ship below). Well-known artists such as René Magritte created these kinds of illusions. And finally there are literal optical illusions, which aren't exactly illusions since they've been created intentionally to confuse the mind. The classic examples of these are the optical illusions used in psychological texts, where an image could be interpreted in two different ways. Then there are cognitive illusions, which are just as fascinating because they can be interpreted differently by different people. These are caused by physiological factors in the way our eyes and brains interpret elements such as brightness, angles, or movement. These are the 'true' optical illusions – images that make us interpret them the wrong way, for example a still image that appears to be moving or an image that appears to be a particular colour when it isn't. ![]() First there are physiological optical illusions. There are several different kinds of optical illusions, and most usually fall in one of four categories.
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