Am going to go with Moravec's paradox:
Moravec's paradox is the discovery by artificial intelligence and robotics researchers that, contrary to traditional assumptions, high-level reasoning requires very little computation, but low-level sensorimotor skills require enormous computational resources. The principle was articulated by Hans Moravec, Rodney Brooks, Marvin Minsky and others in the 1980s. As Moravec writes, "it is comparatively easy to make computers exhibit adult level performance on intelligence tests or playing checkers, and difficult or impossible to give them the skills of a one-year-old when it comes to perception and mobility."[1]
https://en.wikipedia.org/wiki/Moravec%27s_paradoxIt's remarkably difficult to actually move if you really try to think of all the steps that you take in making it work. Which is part of why I'm fascinated by people who believe that they can't ever pick up an instrument, Mathematics, languages, or any other skill. You don't see babies giving up when they fall down after a failed attempt at walking.
