Stereoscopy. Wikipedia defines stereoscopy as “Most stereoscopic methods present two offset images separately to the left and right eye of the viewer. These two-dimensional images are then combined in the brain to give the perception of 3D depth. This technique is distinguished from 3D displays that display an image in three full dimensions, allowing the observer to increase information about the 3-dimensional objects being displayed by head and eye movements.”
Stereoscopy got very popular very fast. LOL, here is the first internet cafe, or, the first Google Glasses
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Kaiserpanorama consisted of a multi-station viewing apparatus and sets of stereo slides. Patented by A. Fuhrmann around 1890.