Centered on a hand-carved black stone basin, this Zen bathroom features a bamboo spout dripping into steaming water, surrounded by smooth river stones and a fern. A folded cotton towel rests on a stone ledge. Warm backlighting glows through a washi-paper shoji with natural wood lattice, casting soft, diffuse light. Natural materials, restrained color, and gentle sound distill the ritual calm of a Japanese tsukubai.