Maker Mike Ando aka riumplus put a lot of work into thie replica from Riven. Wind it up and watch the holographic video from any angle.
Readers are probably most interested in the Andotrope, which is the main mechanism in the middle that creates the omnidirectional holographic display. It consists of two specially-chosen tablets sandwiched back-to-back inside a black cylinder with viewing slits in front of the tablets, and the whole cylinder rotates at high speed (up to 1200RPM for mine, which gives an effective 40fps). Both tablets synchronise their output, effectively doubling the frame-rate by displaying two images per rotation.
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