A while ago I was thinking how it would be neat to setup an overly-complex automated drum set which used flashy methods to hit the various drums to play beats and whatnot. The backbone of the idea was always having reservoirs of superballs hung from the ceiling which would drop balls at a regular rate to hit the drums. (You could use other things like series of gears or sticks falling down or whatever as well, but balls from the ceiling was always appealing (holy crap what a rhyme).)
Laying in bed last night I was thinking about this again, and specifically thinking about the sort of basin one would want to recollect the balls after they fell and redistribute them properly. I was thinking you wouldn't want to send the same number of balls to each reservoir, as you'd certainly hit the snare more than you hit the splash cymbal or the floor tom. Also, different types of balls may work better on different drums. So, two birds with one stone, let's use different sized balls. The stage would be slanted so the bals would bounce around and go crazy for a while, then eventually collect in front of the drum set and fall through a filter. The filter would basically be a series of halfpipes of different sizes that converge, one above another. At the point where they converge, they would have holes cut through them to let balls fall through (the top being the biggest so they fall through properly). A wheel that grabs one ball at a time, centers it, and drops it through the hole(s) would keep the balls centered to fall through the holes and spaced so they don't hit each other.
But all that is sort of boring. It'd alow for an automated installation somewhere, which is sort of cool, but I like audience interaction (sing with me). So I was thinking, instead of all that, what you should do instead is ditch the filtering basin thing, and set this up in an empty room with no explination at all. There would just be different colored balls scattered all over the room, correspondingly colored tubs hung on the wall and a drumset (everything else would be hidden above the ceiling). So people would walk in, find this thing, and it'd be like fucking MYST.
Some people would bang around on the drums and walk away. Some would steal balls. But some would put a couple of balls in the tubs and they'd hear the soft click-whrrr of an motor coming to life, and a few seconds later those balls would fall on the drums from holes in the ceiling. They'd smile, look at each other, and start running around grabbing all the balls they can, putting them in the tubs. Again, click, whrrrr, but this time a full beat comes to life! The room would drum until it ran out of balls, and they'd learn that if they keep running around putting them back in they'll get farther and farther into the song! Eventually maybe some recorded guitar joins in, the longer you keep it up the better it gets, building and building until eventually fog starts coming out of the vents and lasers slide out from the walls and it's a fucking rock concert that you're powering by putting balls in tubs!!
Then it would end and everything would slide back into place and the rest of the balls would pour out onto the floor, and the people would catch their breath and high-five and leave the room for the next fateful soul to stumble upon.
I really do love this idea.
P.S. The tubs would have holes in the bottom so any samller balls that shouldn't be in there would fall out. And during the automated process that brings the balls into the ceiling they'd have to pass under a just-high-enough stick so balls that are too large would be knocked off and fall back to the floor. At the end of the concert, all tubs would pop open trap doors on the bottom to dump all balls back onto the floor.
P.P.S. Also, maybe all tubs will have some sort of indication when they're running low on balls so you know where to focus.
P.P.P.S. Oh, fuck, or what if there are just a few big yellow balls, but no yellow tubs? You'd keep wondering what to do with them. Then when the lasers slide out from the wall they each have a yellow tub under them, and if you put a yellow ball in there the laser turns on and starts swinging around? You'd be like - "Lasers?? Aw, they must be broken - no, wait, let's try - AWWWWWWWWWWWW YEAHHHHHH!!!!!!!"