Scroll down to the moving spiral so it is centered in your screen.

Stare at the center of the spiral from about a foot away for 30 seconds.

Now look at the back of your hand! Ugh!

Stuff to try
Try looking at a friends face or your own face in the mirror. Try looking at your dog. Try looking at pictures from magazines. Try different body parts (hmmm).

Thank you to our friend, Richard, for animating this graphic.