Strange and interesting tricks of the mind

[rushthatspeaks]

This is the oddest thing I've seen today, courtesy of xsmoonshine.

It really does work, and it isn't a computer trick; if you pause the picture (click and drag, but don't drag) you can see how the art is ambiguous. After a while of focusing, I could get it to go either way at will, despite a very strong initial preference towards clockwise.