Optical illusion: A girl in inverted colors

This is not a sudoku puzzle. :) It’s an optical illusion. I think it’s nice to take a break every once in a while and do something different. So… in this optical illusion we have …

Afterimage: An Eye-Boggling Optical Illusion

Psychologist shares optical illusion that turns a black and white

The Best Optical Illusion Art on the Internet

The Best Optical Illusion Art on the Internet

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

Four optical illusions and the science behind them

Understanding the Science Behind These Mind-Blowing Optical Illusions

Invert color hi-res stock photography and images - Alamy

Optical illusion turns black and white images into COLOUR

Optical Illusion Somehow Transforms Sinister Photo Negative Into

Optical illusion turns black and white images into COLOUR

Inverted Triangle Body Shape: A Comprehensive Guide

The Illusions Index - The Illusions Index

Thatcher effect: The 35-year-old optical illusion that will work