Optical Illusion: Almost 60 percent of people fail to spot the bear in this picture; Care to try? |
Optical illusions, or more correctly visual illusions, require visual deception. The arrangement of images, the influence of color, the effects of light sources, and other factors can all create many misleading visual effects. There have been optical illusions since the ancient Greeks. The Greeks used optical illusions in their construction and artwork. Psychologically, people often ...