Bionic legs or mechanical prosthetic substitutes for the pedal extremities, started out so normally. Now, however, an advertisement for a futuristic soccer boot takes our imagination to a new level.
SF fans remember the Bionic legs from the novel Cyborg; these devices were essentially a substitute for human legs that fit in the same space and had a similar form. A bit later, Neal Stephenson wrote about a way that people with legs could get a bit of a boost; read about the pedomotive from The Diamond Age.
In the real world, things were moving along as well. Powerisers were patented just a few years ago.
Humanoid Robots Tickle The Ivories
'The massive feet working the pedals, arms and hands flashing and glinting...' - Herbert Goldstone, 1953.
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MIT Computerized Bionic Leg Is Part Of The User
'The leg was to function, in a way, as a servo-mechanism operated by Larry’s brain, through the mediation of the electronic brain in the leg.'