ClockWork

After a while, the "Colons" begin to rotate...

Depending on the size and resolution of your screen, you may have to get a bit closer to the screen (or enlarge the picture within your browser) to enhance the effect.

But ATTENTION !!

Some people feel sick or become a pain in the head or the eyes when they stare to long on such movement-illusions.
So stop looking at the picture if it you feel uncomfortable.

I think (but I'm not sure) the illusion was discovered by Akiyoshi Kitaoka, professor of psychology at the Ritsumeikan-University in Kyoto

/Edna