9 projects
Sound leaves one focus of an ellipse in every direction, bounces once, and every single copy arrives at the other focus having travelled exactly the same distance. Step five centimetres off it and half the effect is gone.
Delaunay maximises the smallest angle in a mesh. I checked it exhaustively, and then noticed the maximum is dreadful.
The convex hull of n random points has far fewer than n vertices. How many fewer depends on the shape they came from, not on n.
Turn 137.507° between seeds and they pack perfectly. Turn 137.3° and it falls apart.
Three beads, three ramps, same start and finish. The straight one loses badly.
Draw any closed shape and it turns out to be a stack of rotating circles. Provably, and with a receipt.
Six blobs merging and splitting, their outline pulled out of a grid of numbers by a sixteen-case lookup table.
Ninety scattered points, each repeatedly stepping to the middle of its own territory, discovering honeycomb.
Three thousand cubes that look like rubble from every direction but one, where they line up into a letter.