sandbox

Sand, water, fire and current on a grid that remembers what it is made of. Seventy-odd elements, heat, pressure and wiring.

One number for how each species feels about each other species. Nothing else — and it organises itself into cells and chases.

A million agents, each steering towards the trail the others left behind. No agent knows about any other.

Drag out a planet and see the path it will take before you let go. Gravity anchors that never move, and can be switched off mid-orbit.

Particle life that latches. Two bonds a chain, three a membrane, six a crystal — and you can take hold of any of it and tear it apart.

Particle life where the rules are inherited. A particle's colour is its genome and what it hunts is a preference over colours, so you watch lineages split and go out.

Type a word and get a world. Drifting plates raise the mountains, the mountains and the latitude decide where the rain falls, and the rivers cut at their banks for centuries until a bend pinches shut and leaves a lake.

One line of arithmetic — turn by how many neighbours are on each side. Out of it come cells with a membrane and a nucleus, which grow, divide and die.

Visual audio programming. Patch oscillators through effects into speakers on a node graph, and hear the result change as you build it.