Download Add to Favorites Add to Folder creative writing children's book activities classroom tools language arts and writing vocabulary Create new folderCREATE NEW FOLDER Share The eye actually retains an image for about a tenth of a second after the image has passed. Explore this concept by observing different optical illusions. Grade: 3 | 4 | 5 Subjects: Science Human Body and Anatomy Light and Optics + show tags TYPE: Worksheets Activities Holidays: Alcohol & Drug Awareness Month