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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.

This is a quick activity/demonstration that introduces learners to the concept of index of refraction. Learners place stirring rods in a jar of water and notice they can see them clearly.

Do you have a hard time matching paint swatches with your furniture? When you consider human perception, color is context dependent.

In this activity (13th on the page), learners complete a simple illusion trick to see through their own hand.

In this activity about light and perception, learners discover how a flash of light can create a lingering image called an "afterimage" on the retina of the eye.

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

In this activity, learners control the (apparent) size of a hole with their brain.

In this activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.