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Create an illusion where it appears that your hand has a hole in it. You'll see the results from when one eye gets conflicting information.

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.

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

Known as the waterfall effect, this activity demonstrates adaptation in our visual system.

In this activity, learners create an optical illusion by spinning two attached cups. A round ball seems to magically appear when the cups spin.

We don't normally view people upside down and so our brains aren't accustomed to it.

In this activity, learners surprise their eyes with an optical illusion involving arrows made out of pipe cleaners.