File:Grey square optical illusion.PNG

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Summary

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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Date/TimeThumbnailDimensionsUserComment
current11:20, 24 May 2016Thumbnail for version as of 11:20, 24 May 20161,087 × 844 (143 KB)wikimediacommons>Avayakoptimized losslessly
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