About
Every poster here is drawn by code from a piece of mathematics, then printed to look like a four-ink riso print.
How a poster is made
A formula gives a value at every point of the page. The value is cut into bands, and each band gets one of four inks: a dark key and three colours. The inks are laid down like separate print runs. Each has its own grain, the colours thin out into tints, and each layer sits slightly off register.
A poster is fully described by its settings: the formula, a print number that seeds the randomness, the slider values and the four inks. The same settings always draw the same poster, so every print is rendered fresh at full resolution for the size you order.
The formulas
- Waves & interferenceQuasicrystalPlane waves added at five or more evenly spaced angles, which never repeat.
- Waves & interferenceMoiréTwo fine line gratings laid over each other; the wide fringes come from the overlap.
- Waves & interferenceChladniThe still lines of a vibrating plate, where sand collects.
- Complex numbersNewtonNewton's method run from every point; each root claims one ink.
- Complex numbersConformalContour lines of log f(z) around chosen zeros and poles.
- Complex numbersJuliaThe points that stay bounded under z ← z² + c.
- Growth & physicsTuringGray–Scott reaction–diffusion, simulated until it settles into spots or stripes.
- Growth & physicsStonesAn ideal fluid flowing past stones, ellipses and wings.
- Growth & physicsSpiralsSpiral waves like those in a Belousov–Zhabotinsky dish.
- Geometry & chaosPenroseDe Bruijn's multigrid: rhombi that tile the page without repeating.
- Geometry & chaosVoronoiEvery point belongs to its nearest seed, ringed like agate.
- Geometry & chaosAttractorOne point sent through the same formula millions of times.