折り紙の赤い壁：道路と鉄道に挟まれた細長い敷地

Design a public toilet in the manner of Nao Tamura, on a very narrow leftover plot squeezed between a road and a railway line. Show the building as a series of folded planes in a strong vermilion red, the folds angling and wrapping like a piece of origami so that the walls both enclose the cubicles and screen the approach — no one outside can see in, and the folds create sheltered pockets at the entrances. Detail the surfaces as flat matte panels with crisp folded edges and no visible fixings, the red consistent across every plane so the form reads as one folded sheet. Show three cubicles fitted into the sliver of land, each surprisingly generous inside, with their doors set within the folds. Detail the site honestly — a narrow strip of paving, a guardrail along the road, an overhead railway structure behind, and utility poles nearby. Show the red reading as a deliberate signal against the grey infrastructure. Include a person walking past on the narrow footway. Photorealistic, vivid vermilion against grey, eye-level three-quarter view.