Mind-Blowing Demos Tools

Four simple rules, chosen at random, draw a perfect fern. No one programmed a leaf — the fern is the fixed point of the chaos, and every frond is a tiny copy of the whole.

One equation, one knob. The logistic map x → r·x·(1−x) doubles its rhythm again and again, then dissolves into chaos — and the same pattern of period-doubling appears across all ...

In 1777 Buffon realised you can measure π by dropping needles on floorboards. Watch the probability of a needle crossing a line converge on 2/π — π again, this time from pure geometry and ...

Three tiny rules, no designer, and yet gliders, blinkers and whole ecosystems appear. Click cells to seed life, then watch a universe build itself from nothing.

The "most beautiful equation" in one picture: eiθ is just a point rotating around a circle. Wind θ up to π and you've spun exactly half a turn — to −1. eiπ + 1 = 0.

Evolve 3D creatures from scratch with a real genetic algorithm. Bodies of nodes and muscles are bred alongside their neural nets, then tested on walking, jumping, climbing, sumo and bridge combat.

Any repeating shape — a square wave, a sawtooth, your favourite tune — is just spinning circles added together. Watch a few sine waves stack into a crisp corner, then add more and see it sharpen.

Every ball bounces left or right by pure chance — yet the pile always forms a perfect bell curve. This is the Central Limit Theorem: order emerging from randomness, and the reason so much of nature...

Six classic length illusions — Müller-Lyer, Ponzo, Ebbinghaus, Delboeuf, vertical-horizontal and Jastrow — drawn live, with a strength slider, a measure-it overlay printing true pixel lengths and a...

Spin a real tesseract — a 4D cube — with true four-dimensional rotation. Twist the XW, YW and ZW planes that don't exist in our world, slide 4D perspective until it turns inside-out, and meet its s...

A spinning Necker cube that flips inside your head, a Penrose triangle with an X-ray slider that reveals the cheat, and endless stairs with a ball that descends forever. True 3D rotation of impossi...

8 classic logic puzzles that have stumped clever people for centuries — with progressive hints, full solutions and detective-rank progress tracking. No maths degree required.

Three perfectly deterministic equations, zero randomness — yet the path swirls forever around two wings and never repeats. This is chaos: predictability with a built-in expiry date, the seed of the...

One line — z → z² + c — repeated over and over produces infinite, self-similar complexity. Click anywhere to zoom in forever.

Watch π emerge from pure chance: random points rain on a square with a circle inside, and the ratio that lands in the circle is exactly π/4. No formula — just probability converging on a univ...

A free, offline 3D arena battler in raw WebGL — no assets, no downloads. Riley the wizard smashes endless goblin waves with wand shots, charged blasts, dashes and double jumps — and the goblins evo...

A retro warp-speed starfield with real flight feel: steer with your pointer, throttle from sublight to Warp 9, punch through hyperspace jumps, and watch the light-years stack up as famous exoplanet...