Stereo animation of a rotating diamond structure. Pause the video, and cross your eyes until the two images overlap perfectly in the center, let your eyes relax and it will slowly come into focus (may take a few minutes if this is your first try). Then play the video with Repeat (Loop) on.
<a href="//commons.wikimedia.org/wiki/User:Brian0918" title="User:Brian0918">Brian0918</a>
<span class="int-own-work" lang="en">Own work</span>