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In this activity, learners create a simple “top” from a CD, marble and bottle cap, and use it as a spinning platform for a variety of illusion-generating patterns.

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

In this lab (Activity #1 on page), learners explore how we see color.

This science activity demonstrates the dominant eye phenomena. What does your brain do when it sees two images that conflict?

How can you make one shade of gray look like two? By putting it against two different color backgrounds! This activity allows learners to perform this sleight of hand very easily.

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.

This is an online exhibit about color perception. Learners set a random background color and then try to mix red, blue, and green light to match.