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Inspired Selections: Optical Illustions: part 3

Written by Sam Hardcastle  |  20 December 2017

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Cafe Wall The horizontal lines in this image appear to be sloping, but in reality they’re parallel to one another. Why does it work? Although it’s easy to see the mortar line between two black tiles or two white tiles, it’s much harder to see the mortar line between a white tile and a black one. Your brain fills in the gap by seeing it as part of either a white or black tile. This, in turn, makes the tiles look wider at one end than at the other, creating the illusion of a series of wedge-shaped tiles, which makes the lines appear to slant.

Read more: http://www.dailymail.co.uk/home/moslive/article-1314281/Ten-greatest-optical-illusions.html#ixzz51nzKJrWZ
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Rotating Circles – aAlthough the coils in the image appear to be rotating, in reality they’re completely stationary. The effect works best in peripheral vision, so when you stare at one of the coils it will appear stationary while those around it will appear to rotate. This wonderful illusion was created by Japanese psychologist Akiyoshi Kitaoka from Ritsumeikan University in Kyoto. Vision experts aren’t exactly certain why it works; however, their research has revealed that the shading of the segments that make up the rings is crucial. These segments are arranged in a repetitive pattern consisting of a relatively dark area (yellow) followed by a brighter one (white), then a less bright one (blue), and finally the darkest area (black). Information from high-contrast parts of the image (yellow-white, white-blue and blue-black) travels to the brain faster than that from low-contrast parts (blue-black). It’s believed that this ‘staggered’ information mimics the type of input that the eyes and brain receive when they see genuine motion, and so you end up believing that you’re looking at actual movement.

Read more: http://www.dailymail.co.uk/home/moslive/article-1314281/Ten-greatest-optical-illusions.html#ixzz51nzzplBT
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source: list25.com