I saw this video going around and obviously it piqued my interest. Also, my left jaw is acting up again so I don’t really feel like going out and about, so I found something else to amuse myself with.
I didn’t want to waste paper and my printer was unplugged so I decided to create a silverlight simulation instead. Try it out in fullscreen below:
http://labs.technoeuphoria.com/impossiblesquare/
You’ll discover that when you re-arrange the pieces as in the video, the blue and green pieces go beyond the boundary at the bottom. This is probably why even when you make the paper cut-out version and try out yourself, the illusion holds because you’ll have no reference to the original square.
At least now I have that out of my system. My jaw still hurts though 
being in tech 
You can also tell that he has to squeeze the pieces in to make them fit when he gets the “hole”. They’re made of some kind of foamy material so he could probably squeeze it even more before it becomes obvious.
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