Pattern Factory

Define a small motif, then loop it. The result is parametric art — a 3-line program producing visual complexity that would take a thousand lines if you wrote each step out.

Watch a tree grow by recursively applying the same branching rule. The recursion depth slider makes the relationship between depth and complexity tangible — and shows why recursion is the natural language for self-similar data.

Arrange a 16-step grid of percussion. The same loop primitive that drives every sequencer in music software — and a hands-on version of the cyclic data structure underneath.

Design one tile, then tile a plane. The same repeat-mode primitive that powers CSS Grid, wallpaper rendering, and procedural texture generation in games.

Slider for fib(N); side-by-side call trees, naive recursion vs memoized. At N=30, naive needs ~2.7 million calls; memoized needs 59. The dynamic-programming insight in its purest form — caching turns an exponential algorithm into a linear one.

Click any of 36 CS concepts plotted on a 2D semantic map and watch its three nearest neighbors light up. Toggle cosine similarity vs euclidean distance to see why every vector database defaults to cosine — and feel, in your hand, what 'meaning is a position' actually means.