Pretty cool stuff.

(Stolen from Toronto Mike)This is a pretty awesome optical illusion. What colours do you see? Green and blue? I thought so too. THe lines are the same colour. Don't believe me?

There's some add ons for Firefox that identify colours. Check if you want. Both are RGB (0, 255, 150)

"The reason they look different colors is because our brain judges the color of an object by comparing it to surrounding colors. In this case, the stripes are not continuous as they appear at first glance. The orange stripes don’t go through the "blue" spiral, and the magenta ones don’t go through the "green" one."