Shows a cube gliding in constant height over a checker board, and then lifting off. Inspired by <cite style="font-style:normal">Daniel Kersten, Pascal Mamassian, David C. Knill (1997). "<a rel="nofollow" class="external text" href="http://www.cns.nyu.edu/csh04/Articles/Kersten-etal-97.pdf">Moving Cast Shadows Induce Apparent Motion in Depth</a>". <i>Perception</i> <b>26</b>: 171-192.</cite> The cube always follows a straight line, only its shadow changes its direction on lift-off.
<a href="//commons.wikimedia.org/wiki/User:Jochen_Burghardt" title="User:Jochen Burghardt">Jochen Burghardt</a>
<span class="int-own-work" lang="en">Own work</span>