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Movatar exists as both an inverse avatar and inverse motion capture system. That is, rather than having a human’s qualities and motions captured and mirrored by a representation within a computer, Movatar allows the algorithmic behaviours of a digital representation to actuate limb motions in a human. The notion of the puppet usurping the puppeteer, however, is only one aspect of a larger symbiotic (real-world/digital) system. The Movatar in fact has three distinct (visual, aural and behavioural) phases to its recurring life-cycle: 1. Interphase the digital Movatar behaves independently of the human body, according to its own internal algorithms within a virtual space; 2. Transmission the Movatar decides to engage with the human via a ‘motion prosthesis’. This pneumatically-powered device, worn over the upper torso and arms, and acting as a physical analogue to the Movatar’s muscles, actuates the human body and generates sounds which correspond to the Movatar’s behaviours; and 3. Feedback these sounds, generated by the real-world motion prosthesis, feed back as input to the startled Movatar, which responds by modifying its own body and behaviour. The modified Movatar then disengages from the human body/motion prosthesis before returning to Interphase to restart the cycle.