Probability.

Samples pile up into a shape, and every scene here can be turned round. A 3D Galton board growing a bell-shaped mound, Monte Carlo pi from points in a cube, a coin-flip histogram stacked out of coins, a ridgeline of histograms settling into the normal, and a pair of dice building the triangle of sums.

Galton boardA thousand balls through a pyramid of pegs, piling into a bell you can walk round.
Monte Carlo piPoints raining into a cube, counted against an eighth of a sphere.
Coin flip histogramThe heads in 20 flips, stacked out of coins into the binomial's bell.
Normal from samplesFive histograms, ten to a thousand draws, settling into the bell.
DiceTwo dice tumbling, their sums stacking into a triangle.