Grass at eye level, each blade a closed-form curve found in O(1), backlit so a low sun lights through it. Every blade reads one travelling wind field, so a gust visibly arrives from one side and sweeps across the meadow rather than everything shaking at once.
Drawn with: a WebGL2 shader.
Reacts to and looks like: gpu, webgl2 and grass.
Family: Visualiser.
Runs in your browser. The preview above is the same program the renderer uses.