Hyperbolic Organ
Play a negatively-curved universe: an Escher-style {8,3} tiling in the Poincaré disk that you translate and spin with the keys — each hyperbolic move rings one just-intonation interval and shifts the drone.
the disk drifts on its own · press Play to unlock sound and the keys
Read the design notes
Every visible cell is a copy of one central 8-gon, mapped out to the rim by a Fuchsian reflection group — geodesic edges are arcs of circles orthogonal to the boundary. Your keys compose Möbius isometries of the disk (SU(1,1)); the drifting lattice is those isometries streaming.
After M.C. Escher’s Circle Limit III (1959), the Poincaré disk model, and H.S.M. Coxeter. This is the SVG, keyboard-played inversion of the lab’s 1044-hyperbolic-bloom(a mic-driven WebGL bloom of the same tiling). See README.md.