Visual Illusion

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Print this figure on a sheet of paper and then give it a slight twirling motion as if you were swirling water around in a dish. The cog-wheels will appear to revolve slowly, while the other wheels turn rapidly in the opposite direction.


Arthur Mee and Holland Thompson, eds. The Book of Knowledge (New York, NY: The Grolier Society, 1912)


TIFF (full resolution)

2400×549, 1.3 MiB

Large GIF

1024×234, 36.7 KiB

Medium GIF

640×146, 22.8 KiB

Small GIF

320×73, 9.7 KiB