DEPTHPERCEPTION
Depth perception
Depth perception is the visual ability to perceive the world in three dimensions and the distance of an object. Depth sensation is the corresponding term for animals, since although it is known that animals can sense the distance of an object, it is not known whether they "perceive" it in the same subjective way that humans do.The above text is a snippet from Wikipedia: Depth perception
and as such is available under the Creative Commons Attribution/Share-Alike License.