File:Grey square optical illusion.PNG

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Original file(1,087 × 844 pixels, file size: 143 KB, MIME type: image/png)

Summary[edit]

Description

An optical illusion. Square A is exactly the same shade of grey as square B. See demonstration.

Date Original in 1995, this file in January 2004
Source File created by Adrian Pingstone, based on the original created by Edward H. Adelson
Author Original by Edward H. Adelson, this file by Gustavb
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File history

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Date/TimeThumbnailDimensionsUserComment
current10:20, 24 May 2016Thumbnail for version as of 10:20, 24 May 20161,087 × 844 (143 KB)Avayak (talk | contribs)optimized losslessly
21:13, 13 January 2008Thumbnail for version as of 21:13, 13 January 20081,087 × 844 (159 KB)Mahahahaneapneap (talk | contribs)pngcrushed
03:54, 24 April 2007Thumbnail for version as of 03:54, 24 April 20071,087 × 844 (214 KB)Jrockley (talk | contribs)much larger version
00:41, 9 April 2007Thumbnail for version as of 00:41, 9 April 2007522 × 408 (70 KB)Jrockley (talk | contribs)Prepared for Wikipedia by Adrian Pingstone in January 2004, based on the [http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html original] created by Edward H. Adelson. See also [http://en.wikipedia.org/wiki/Same_color
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