Exploratorium
Afterimage
To illuminate how afterimage occurs, create a star, square, or other geometric-shaped light for learners to look at for 30 seconds. Then, have them explain what they see as they shift their focus to a blank wall. A full explanation of...
Exploratorium
Exploratorium: Science Snacks: Perception
Try one of these 33 perception activities in your classroom.
Curated OER
Science Kids: Science Images: Afterimage
The following picture is an example of an afterimage, a type of optical illusion that continues to appear in one's vision even after you finish looking at the original image.