打ち放しコンクリートの公衆トイレ：ボリューム、開口部、光の隙間

Design a public toilet as a single monolithic concrete object. Show a compact rectangular volume cast in board-formed fair-faced concrete, its board marks running horizontally and continuing uninterrupted around every corner, with the form-tie holes on a strict grid. Detail the openings as deep apertures cut into the mass with no frames, no trim and no visible door head — the doorways simply voids in the concrete, their reveals as carefully finished as the outer face. Show a continuous horizontal slot of clerestory glazing just below the roof line on all four sides, so the flat roof slab appears to float on light with no visible support. Detail the roof as a thin concrete plane with a crisp drip edge. Show the interior glimpsed through one opening as the same concrete, with only stainless fittings and a mirror as additions. Detail the ground meeting the building without kerb or plinth, the concrete simply continuing into a cast apron. Show low afternoon sun raking across the board texture. Photorealistic, monolithic, grey with sharp shadow, low three-quarter view.