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

In this quick activity about size and scale (on page 2 of the PDF under What's Nano?

In this activity, learners find out why some mineral sunblock rubs in clear. Learners compare nano and non-nano sunblocks and discover how particle size affects visibility.

In this activity, learners explore a scale by comparing objects, which look similar but have different weights. Learners predict and then measure the weights of various objects using a scale.

In this activity, learners explore their eye pupils and how they change.

In this activity, learners conduct a simple test to find their blind spot.

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

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.

Learners will explore the concept of angular distance, and investigate why the moon appears to be the same size as the sun during a solar eclipse, despite the sun being much larger.

In this online activity exploring our perception of "cuteness," learners adjust various factors (like pupil size or length of limbs) on a face, a cat, and a hammer.

In this activity, learners investigate how geometry plays a role in perspective.

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

In this activity, learners investigate the touch sensory system and discover how to plan and carry out their own experiments.