The Perceptoscope Lets You Sight-See in Augmented Reality
[Philip Lelyveld comment: this is such a great idea for theme parks and historic sights.]
The perceptoscope is an augmented reality device for fixed locations. Before getting too much into the specifics, imagine that you could walk up to a perceptoscope placed near the Empire State building. You look through the eye pieces and you see the city as it was before the building was constructed. At the flip of a switch you can watch the building take shape right in front of you. All this, with true 3D vision and motion tracking.
The stationary aspect of the perceptoscope gives it several advantages making implementation much easier than something like the Microsoft hololens or CastAR. Since it is stationary, you can program it with an exact position in mind. The angles of rotation in both axes are measured precisely in a mechanical fashion, so no complicated tracking systems are necessary at all. The standard form factor of a landscape viewer allows for plenty of room to add electronics and fancy optics.
See the full story here: https://makezine.com/2016/06/03/the-perceptoscope-lets-you-sight-see-in-augmented-reality/