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When humans perceive the environment around them, each eye
sees a different perspective image. These two images give rise to
the perception of true depth.
A stereoscopic image is composed
of a right perspective and a left perspective image.  In order to
see a stereoscopic image, you must be able to view both of these perspective images simultaneously. When you finally see the
depth information you have FUSED the images.
Most printed
images which look 3D are classified as monoscopic images. Monoscopic images try to simulate depth by using shadows
and rendering techniques. The image above is an example of
a flat monoscopic image. A stereoscopic image, on the other
hand, appears to have real depth where objects can even seem
to leave the surface of the display device and hover in the middle
of the room. The "canvas" of a monoscopic image is a flat
surface. For a stereoscopic image, the "canvas" transforms into
a window through which a true 3D environment appears.

The human brain uses two fields of view to create the stereoscopic vision later perceived by the brain.