Banging one's head against a wall (metaphorically speaking) requires a bit of restraint and more than a little practice for breakthroughs to occur.
Bang too little and you are left with nothing but a dull ache.
Bang too hard and you will be too dizzy to see the breakthrough. (Note: Please take care to not bang so hard that you must be carried off and tended to.)
Bang just right and all sorts of old stuff falls away to reveal something surprising and delightful for you to explore.
Bang on enough walls and you just might start to find art.