How To Melt Your Brain With A Single Piece Of Paper

IT JUST KEEPS FOLDING. Meet the Hexaflexagon.

Vi Hart's video explains how it works (via io9). You can also find printed directions here.

For a real treat, though, try this Flexagon creator — it'll let you choose an image for each "face" of your Flexagon, then print simple, pre-drawn folding instructions like this:

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