QR encodes data in black-and-white squares — right for a 1994 camera. Cameras changed; the squares didn't. So we spent the slack on looks.
TLcube splits a hexagonal cell into three rhombic faces and encodes data in the rank order of their brightness, not in absolute values — shift exposure, gamma or contrast and the answer survives. Four silhouettes, an optional fallback QR, browser generator and scanner.
Free to use, like QR. No licence fee, no per-scan cost. Apache-2.0.
