I’m always frustrated by my inability to map finger movements onto those required by almost any musical instrument (yes, even the tambourine).
Today’s invention is a screen fitted to a piano which, instead of all that squiggly symbolism from left to right, shows ten finger positions above the keys that need pressed to make the right noises.
The screen would animate these positions by scrolling them towards the player (as if printed on a roll of paper). This would aid development of some anticipation of where the fingers need to move to next.
…Necessarily rudimentary for those of us excluded, neurologically, from any conventional music theory.