Eye Power

Hi class,

Here's something you can try as an excuse to take a break from your work!

Enjoy!

Cheers,
Miss Elise Yu

Stare at the black cross in the middle for 10 - 20 seconds.

You will begin to notice something strange happening.

A demonstration of the lilac chaser optical illusion, also known as the Pac-Man illusion. When one stares at the cross in the center of the image for 10–20 seconds, two effects will appear in order: One, the moving empty space between dots will appear as a green dot. Two, the moving green dot will appear to wipe out the purple dots, until only the green dot is visible. A separate effect appears if the eyes move away from the center, showing a ring of green dots.

Courtesy of Wikipedia