Stare at the red center dot for a while (20 seconds works for me), then stare at something else. You should see it grow... Click on the animation to change its direction. Stare at it while it is growing, and then when you look at something else you'll see it shrink...
This is a remake of Mr_awesome_MC's "hhhmmmmmm" project. But instead of rotating a spiral, this one keeps resizing a bunch of concentric circles. The effect is about the same though. :-)
