Monday, November 2, 2015

Visual Illusions

Darwin Illusion- Visual illusion in which retinal impressions persist after the removal of a stimulus, believed to be caused by the continued activation of the visual system. For example, if you stare at the center of the image form at least ten seconds then look at a wall or blank surface, you will see the face of Charles Darwin hence the name the Darwin Illusion. Charles Darwin's face is what we refer to as an afterimage.















Cafe Illusion- The horizontal lines in this image appear to be sloping, but in reality they're parallel to one another. This is because 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 makes the tiles look wider at one end than at the other creating the illusion of a series of wedge-shaped tiles. This is what makes the lines appear to slant. 









Impossible Staircase(The Penrose Stairs)- The actual model is separated at the right stair, but you can't see the split, because your visual system assumes that it is seeing this model from a non-accidental point of view. This causes you to assume that the stairs are joined.







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