That's awesome. I didn't know those things could be animated.
I see a swimming shark as well.
Heh, I remember the first time I saw one of those things. I was either in 3rd or 6th grade. I didn't know how to do it. FELT SO INADEQUATE.
Edit:
I also learned how to see the image in both 3D form, and as a cutout in the background. I can switch between those views at will. Spooky!
(I can also switch the direction easily on those rotating dancers/faces illusions. Multiple orgasms!!! wat)
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