Optical illusion: Girl in inverted colors

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

The Illusions Index - The Illusions Index

Optical illusion that causes brain to IMAGINE color that doesn't exist leaves the internet baffled

Afterimage: An Eye-Boggling Optical Illusion

5 Optical Illusions To Test Your Personality: Interesting QUIZ

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

The Illusions Index - The Illusions Index

Understanding the Science Behind These Mind-Blowing Optical Illusions

Optical illusion - Wikipedia

Four optical illusions and the science behind them

Photos of Mind-Boggling Optical Illusions and How They Work

Optical illusion that causes brain to IMAGINE color that doesn't exist leaves the internet baffled

Incredible optical illusion means you'll see this black & white picture look very different

How this trippy illusion will make you see an 'expanding black hole