chromaSpill is a real-time WebGL2 fluid instrument that reimagines the ancient craft of Suminagashi as a study in tactile human-computer interaction.

It treats the screen as a continuous physical medium governed by Marangoni surface tension, viscosity, and inertial flow.

By coupling a GPU multigrid fluid solver with signed-distance pigment tracking, every drop of ink and pass of the stylus initiates a dialogue between human gesture and emergent math.

It is an experiment in replacing mechanical control with physical intuition, transforming software from a command-driven utility into a responsive material.