This nifty optical illusion has been circulating on the Internet for sometime, and though I generally avoid pop-culture, I thought I’d convert some of the Utah Arts Festival images for your amusement. Enjoy!

Directions: With your mouse off the image, stare at the dot in the center for 30 seconds. Then without moving your eyes, move the mouse over the image.

And here is the original image (in color.)

Follow the link for a few more of these magic color optical illusions.

ref: http://www.johnsadowski.com/big_spanish_castle.php & http://www.johnsadowski.com/color_illusion_tutorial.html