A two-ink stencil print, in motion. Broad pink shapes and a striped blue wash flow slowly across cream paper. Each ink is a grainy stochastic screen, the two overprint into purple where they meet, and the second ink sits a few pixels out of register and drifts round, the way a two-drum risograph print does. The grain and the uneven ink coverage stay fixed to the paper while the shapes move through them, so it reads as a print rather than a filter.

Both inks and the paper are settings, along with misregistration, grain size, ink density, stripes, shape size and swirl. The demo pairs pink and blue, teal and orange, yellow and green, purple and red, and black and red, plus a way-off-register look and a Behind text preset.

Made for zines, small presses, print fairs, studios, music and event pages, stream backgrounds and video. Its reduced-motion setting holds it still on its poster frame for visitors who ask for less motion, and a veil setting thins the inks so text reads on top. At the Behind text preset, dark text keeps a contrast ratio of at least 7.3:1 against 98 % of the background under it.

What you get: a GLSL ES 3.00 fragment shader for plain WebGL2, an ES module that returns a three.js ShaderMaterial, a Shadertoy version, an offline demo page with a settings panel, a 10-second 1920 x 1080 H.264 loop that plays end to start without a seam, the same loop upright at 1080 x 1920 for vertical video, and the poster frame as a PNG (and a WebP for the web). One pass with no textures, about 1.8 ms of GPU time per 1920 x 1080 frame on a recent laptop, measured in headless Chromium. The README covers set-up, reduced motion, every uniform and performance notes.