This suggests it is the visual feedback of seeing an arm rather than the feedback from nerves within it that stops the brain getting confused.

BBC: What phantom limbs and mirrors teach us about the brain

But in each of these cases we are really dealing with customer feedback rather than core innovation.

FORBES: Should Your Focus be a Collaboration or Innovation Platform?

You will always have to tweak and refine, so why not let the real market give you feedback rather than guessing on your own.

FORBES: Let Go Of Perfectionism: Balancing A Job and A Side Business, Part 2