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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.

In this activity, learners calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper.

In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system.

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

In this activity (16th on the page), learners play a variation of the "I Spy" game to explore color. Learners work in teams with each team assigned a color.

In this activity about light and perception, learners create and observe moire patterns.

In this activity, learners will explore how their own eyes work by experimenting with their photoreceptors.

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.