夜間の床面洗浄照明：座席下から照らされる光

Design park seating lit entirely from within itself after dark. Show a long low bench in a night-time park where the only light source in the frame is a continuous warm LED strip recessed into the underside of the seat, hidden behind a shadow gap so the fitting itself is never visible from any standing position. Detail the light as washing downward and outward onto the paving, producing a bright pool directly beneath and along both sides of the bench that fades out within a couple of metres, so the seat appears to hover on a cushion of light. Show the effect on the object as unusual and deliberate: the bench's own underside and legs are brightly lit while its seat and back stay dark, inverting the way things normally read. Detail two seated figures lit from below at the waist and legs, their upper bodies falling into shadow, faces barely visible. Show the surrounding park as genuinely dark — grass reading almost black at the edge of the pool, tree trunks catching only a faint spill, no other lamps anywhere. Detail the paving texture as sharply raked by the grazing light. Set it in an urban park at night with distant building windows beyond. Photorealistic, luminous, warm pool in deep blue darkness, low eye-level view.