The MadSci Network, offered through Washington University Medical School in St. Louis, offers a fascinating tour of the human body using digitized images generated by the National Library of Medicine's Visible Human...

This activity introduces the creation of afterimages formed from a prolonged stimulation of the eye’s retina. A flashlight, paper, and tape are used to produce afterimages viewed on one’s hands and a more distant wall. ...

This Exploratorium site contains an activity about afterimages, the lingering images seen after staring at a particular stimulus. Participants look at bird shapes of different colors for a while and then look away,...

This site contains an activity demonstrating how one's eyes influence each other and what occurs when two eyes receive conflicting information. The participant looks through a paper tube with only one eye to perform...

This activity deals with perception by demonstrating how two eyes can see the same thing very differently. A mirror is used to look at a blank wall with one eye and at a person with the other, causing parts of the face...