Optical illusions
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.
Negative afterimage
Turn this black and white image full color by simply staring at it.
Download the handoutBlind spot
Learn how to make the black spot on this image disappear by closing one eye.
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Are the horizontal lines straight or crooked? Are the two blocks the same color?
Download the handoutCircles and Dots
Are the orange circles the same size? Also, how many black dots are there?
Download the handout