Built a companion scientific testbed — MUJŌ Atelier — with 5 standalone lab experiments. Each experiment isolates and compares one physics layer: Darcy tensor diffusion vs. Lattice Boltzmann D2Q9 fluid bleed, single-layer Kubelka-Munk vs. Saunderson 3-layer glaze stacks, 6 botanical washi substrates with different fiber structures, and an M4 Pro hardware profiler measuring per-pass GPU timings. The Atelier is the "show your work" for the simulation — same ethos as the Gemma 4 benchmark suite, different domain. If someone asks "how does your Kubelka-Munk compare to LBM?" the answer is a side-by-side live experiment, not a paragraph.