Shape

The edge
is the law

Inside the form, a value holds. Outside, it does not. The boundary you see is not decoration — it is the edge, drawn.

Try it →

calm / within the form

—

turning / beyond

—

reaction / the edge

—

Move your cursor. The form reaches toward it — calm territory extends where you point, the edge follows.

Three arrangements

calm

Positive condition

A value fits X. The form admits it. The region glows blue, the computation proceeds.

turning

Negative condition

A value never fits Y. The form excludes it. Orange, void, the pipeline goes silent.

fn[n]

Categorical computation

Work selected by index from a function space. Gold — the reaction where structure meets choice.

Not a tool. Not a template. A shape held against a void — and everything else is the edge between them.