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Shadows are the topic of a book recently reviewed on the... website (The Shadow Club by Roberto Casati) - it's nothi... book, but here's a stunning optical illusion featuring s...
This optical illusion is reproduced with the permission ...
This is sim

Popular Science Feature - Chessboard Optical Illusion
http://www.popularscience.co.uk/features/feat16.htm

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Shadows are the topic of a book recently reviewed on the Popular Science website (The Shadow Club by Roberto Casati) - it's nothing to do with the book, but here's a stunning optical illusion featuring shadow:

This optical illusion is reproduced with the permission of Professor Edward Adelson of M.I.T. Click here for details on the Professor's site. Thanks also to Andy Grüneberg for bringing this to our attention.

This is simply the best optical illusion we've ever seen. It illustrates why the really interesting thing about shadows is not what they are - simply the absence of light, contrasted against an area where light is hitting - but how our brains perceive them:

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<p class="MsoNormal"><i><font size="2" face="Verdana">Shadows are the topic of a book recently reviewed on the Popular Science website (</font></i><font size="2" face="Verdana"><a href="../reviews/rev135.htm"><font color="#ff0000">T</font>he Shadow <font color="#ff0000">C</font>lub</a><i> by Roberto Casati) - it's nothing to do with the book, but here's a stunning optical illusion featuring shadow:</i></font></p> <p align="left"><font color="#000000" face="Verdana"><small>This optical illusion is reproduced with the permission of Professor Edward Adelson of M.I.T. <a target="_blank" href="http://www-bcs.mit.edu/people/adelson/checkershadow_illusion.html"> <font color="#ff0000">C</font>lick <font color="#ff0000">h</font>ere for details on the Professor's site</a>. <span lang="en-gb"> Thanks also to Andy Gr&#xfc;neberg for bringing this to our attention.</span></small></font></p> <p align="left"><font size="2" face="Verdana">This is simply the best optical illusion we've ever seen. It illustrates why the really interesting thing about shadows is not what they are - simply the absence of light, contrasted against an area where light is hitting - but how our brains perceive them:</font></p>