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In this activity, learners discover that it's difficult to distinguish between two different shades of gray when they aren't separated by a boundary.

In this activity about light and reflection, learners discover that what you see is often affected by what you expect to see.

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

In this game (4th activity on the page) about hearing, learners test their ability to identify various sounds without looking.

In this activity (last activity on the page), learners make a model of the eardrum (also called the "tympanic membrane") and see how sound travels through the air.

In this optics activity, learners make a lens and explore how the eye manipulates the light that enters it.

This activity (9th activity on the page) about hearing demonstrates to learners the importance of having two ears.

Learners use two mirrors to explore how images of images of images can repeat forever.

In this activity (12th on the page), learners investigate their ability to discriminate (see) different colors.

In this activity (7th activity on the page), learners use their sense of hearing to find a "sound match." Learners shake containers filled with items like dry seeds, sand, beans, etc.

In this game-like activity (5th activity on the page), learners explore their auditory acuity as well as the importance of having two ears.

In this activity (page 2 of PDF), learners play with a lens and a piece of paper to focus an image on the paper. Learners look at different things, and see how the lenses affect the image.

In this activity (17th on the page), learners investigate why you cannot see colors in dim light.

This activity (8th activity on the page) tests learners' ability to identify things using only the sense of hearing.