Visual Cliff

Visual Cliff- "visual cliff involves an apparent, but not actual drop from one surface to another. This tool was originally developed to determine if infants had developed depth perception. A visual cliff is created by connecting a transparent glass surface to an opaque patterned surface. The floor below has the same pattern as the opaque surface. This apparatus creates the visual illusion of a cliff, while protecting the subject from injury." about.com

Very cool experiment for those interested in child psychology. The visual cliff offers very cool ways to offer depth perception with the study of infants.