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Mix-N-Match Light
The ExploratoriumAdd to list DetailsThis 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. Although this is a perception activity, it also...
See It to Believe It: Visual Discrimination
University of WashingtonAdd to list DetailsIn this activity (12th on the page), learners investigate their ability to discriminate (see) different colors. Learners arrange jars, each filled with water and different amounts of food coloring,...
Dark Adaptation
University of WashingtonAdd to list DetailsIn this activity (6th on the page), learners investigate how photoreceptors in the eye (rods and cones) "adapt" to low light conditions. Learners sort similar bottle caps in a well-lit...
X-Ray Vision?
University of WashingtonAdd to list DetailsIn this activity (13th on the page), learners complete a simple illusion trick to see through their own hand. Learners roll up a piece of notebook paper into a tube, arrange their hands in a...
Far-Out Corners
The ExploratoriumAdd to list DetailsAre there boxes, is this an illusion, or is this real life Q-bert? Illusions are always fun to build especially when you can build them. Close one eye after making a Far-Out Corner and the "...
Stroboscope
Community Science Workshop NetworkAdd to list DetailsIn this activity (posted on March 20, 2011), learners follow the steps to construct a stroboscope, a device that exploits the persistence of vision to make moving objects appear slow or stationary....
Sliding Gray Step
The ExploratoriumAdd to list DetailsHow 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. They will be...
The Blind Spot
University of WashingtonAdd to list DetailsIn this activity (1st on the page), learners find their blind spot--the area on the retina without receptors that respond to light. Learners can draw their own blind spot testers, use the provided...
Drop IT!: Depth Perception
University of WashingtonAdd to list DetailsThese two activities (4th on the page) demonstrate the importance of two eyes in judging depth. In the first activity, two learners compare the accuracy of dropping objects into a cup using only...
Shifting Backgrounds, Shifting Images
University of WashingtonAdd to list DetailsIn this quick activity/demonstration (5th on the page), learners explore depth perception. Learners look at an object in the distance, close one eye, hold up their finger in line with the object,...