Optical illusion: Girl in inverted colors

1. Stare at the red dot for 30 seconds. 2. Look at a white wall and start blinking.

Photos of Mind-Boggling Optical Illusions and How They Work

Fun with Ambiguous Images - Art of Play

12 optical illusions that show how colour can trick the eye, The Independent

7,682 Optical Illusion Stock Photos - Free & Royalty-Free Stock Photos from Dreamstime

Stare at Red dot illusion, Curious Case of the Red Dot: This 'insane' optical illusion will turn all your surroundings hazy

The Best Optical Illusion Art on the Internet

Mindfreak] Staring At This Black And White Sony Ad Will Make You See In Color

Optical illusion pictures: All the best mind-bending images from around the world

This optical illusion transforms a negative image into full colour - but can you see it?

I can't see optical illusions. What's wrong with my brain? - Quora

10 mind-melting optical illusions that will

Optical Illusion: Definition, Types, Explanation, Working And Pictures

The Illusions Index - The Illusions Index

The Best Optical Illusions and What They Reveal About Our Brains

Educator How-To: The eyes have it in this DIY optical illusion