- Same color illusion
The same color illusion — also known as Adelson's checker shadow illusion, checker shadow illusion and checker shadow — is an
optical illusionpublished by Edward H. Adelson, Professor of Vision Scienceat MIT in 1995.cite web|url=http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html|title=Checkershadow Illusion|first=Edward H.|last=Adelson|year=2005|accessdate=2007-04-21] The squares A and B on the illusion are the same color (or shade), although they seem to be different. This can be proven by copying the image into an art program and sampling the color of A and then of B, which will show that they are in fact the same color.
"When interpreted as a 3-dimensional scene, our visual system immediately estimates a lighting vector and uses this to judge the property of the material."cite web|url=http://www.michaelbach.de/ot/lum_adelson_check_shadow/|title=michaelbach.de|accessdate=2006-06-10]
The left image below shows what appears to be a black and white checker-board with a green cylinder resting on it that casts a shadow diagonally across the middle of the board. The black and white squares are actually different shades of gray. The image has been constructed so that "white" squares in the shadow, one of which is labeled "B," are actually the exact same gray value as "black" squares outside the shadow, one of which is labeled "A." The two squares A and B appear very different as a result of the illusion. A second version of the same picture includes a rectangular bridge connecting square A and B to show they are the same shade of gray.
* [http://web.mit.edu/persci/people/adelson/checkershadow_description.html Explanation of the effect]
* [http://www.archimedes-lab.org/color_optical_illusions.html Illusion of colours]
* [http://www.metacafe.com/watch/925105/lightness_illusion/ Video animation - Checkershadow Illusion]
* [https://www.dcs.qmul.ac.uk/~norman/papers/probability_puzzles/optical_index.html Alternative animation of the illusion]
* [http://www.michaelbach.de/ot/ Optical illusions]
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