Below are free to use, class-friendly printouts that provide an optical illusion and an explanation of their behavior. These were originally distributed by ARVO at the USA Science and Engineering Festival. Use them as part of an Optical Illusion themed outreach event.
Can you make this red and green image change colors?Download the handout
Turn this black and white image full color by simply staring at it.Download the handout
Learn how to make the black spot on this image disappear by closing one eye.Download the handout