Buffon's Needle

Interactions

Click the floor: Buffon tosses a needle toward that spot; it still bounces and skids to a random rest and is counted
Click the sieve: it jerks and swings, and fifty needles fall through at once
Drag a crack between floorboards: every board widens or narrows, the chalk diagram follows and the estimate stays near π
Click the slate: Buffon wipes it, the maid sweeps the floor and the experiment starts again
Idle: hand tosses, then the sieve; the maid sweeps; rounds with a bent needle and a noodle, then a long needle; a child throws peas at a circle in a square; the cat bats a needle now and then