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

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

In this easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils.

This is a quick and simple demonstration about reflexes (fourth activity on the page). One learner stands behind a see-through barrier like a window or wire screen.

In this demonstration (18th on the page), learners conduct a simple test to explore how the cornea refracts light, which is further bent by the eye lens through a process known as accommodation.

In this quick activity/demonstration (5th on the page), learners explore depth perception.

This is a quick and simple demonstration about reflexes (second activity on the page).