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In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired.

In this optics/mathematics activity, learners use two hinged mirrors to create a kaleidoscope that shows multiple images of an object.

In this activity about depth perception, learners create an optical illusion in a shoe box.

In this activity, learners construct a device that allows them to view 2-D images in 3-D.

Are there boxes, is this an illusion, or is this real life Q-bert? Illusions are always fun to build especially when you can build them.