What’s old is new again, history goes in cycles etc. – is all true. One of the earliest widespread experiments in photography – dating to the mid 1800s or earlier – was that of stereoscopy: the making of a three-dimensional image from two normal flat images but shot from a relatively offset position. Though there are many methods of varying complexity that can be used to create the illusion of three dimensions, they all fall back to the same fundamental theory: we humans physiologically have stereoscopic vision because we perceive an object from two slightly different positions; our brains interpret both the difference in images and probably also the physical position of eyeball, focus muscles, iris etc. to gauge relative spatial position and absolute distance. Without this – two dimensional images are reliant on cues such as overlap, shadows, fade/haze etc. to create suggestions of distance and position. Photography itself is the projection of a three dimensional world onto a two dimensional recording medium: this brings about significant limitations in reproduction and fidelity, but at the same time opens up great possibilities for artistic interpretation that a person with normal vision simply cannot see with their naked eyes. In essence, we are forcing both eyes to see the same image at the same time.
