A marble-music machine you build by hand, drop emitters, chimes and ramps, then let gravity carry marbles down to play the melody.
Lay out a contraption on the canvas: emitters release marbles, ramps and deflectors steer their fall, and chimes ring a note whenever a marble strikes them. Place and angle your parts so the marbles bounce through them in rhythm, and the whole machine becomes an instrument that plays itself.
Two real things meet here. A carillon is a genuine instrument — at least 23 tuned bronze bells, played from a keyboard of wooden batons struck with the fists, an invention of the Low Countries, with the first properly tuned one cast in 1644.
The other ancestor is the Rube Goldberg machine: a contraption that accomplishes something simple by an absurdly elaborate chain of causes.
Crossing them is the original idea. A real carillonneur strikes the bells directly; here you build the machine that strikes them, so composing and engineering become the same task — a melody is a sequence of ramps that happens to produce it.
Carillon is an original free browser toy that turns a falling-marble physics machine into a musical instrument, blending construction-sandbox building with generative, hands-off music.