all of them are there only to make sure that each of your eyes is seeing the particular image meant for that eye. In your books, the intermittent display scans and shutter glasses of your computers. The silver screen and polarized glasses in your cinema theaters, the red & blue prints and anaglyphic glasses Instead, if two photographs of the same subject are taken with an interocular separation and fed discreetly to our individual eyes, our brain can be fooled into thinking that it is seeing a real object - not an image. If we present the photograph of a subject to both our eyes, we see it in 2D. This is exactly how our two ears make possible stereophonic hearing for us. Our brain distinguishes the spatial separation between individual objects and interprets it as depth (Z axis). Our eyes, separated by an interocular distance of about 2.5 inches, take in these two images that have slight differences between them. These two images - both in 2D (Height and Width.
Falling on the retinas in our eyes, there are two images.
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