Massive brutalist concrete swimming pool interior, towering geometric walls with narrow vertical windows casting striped light, Olympic-size pool with still cyan water reflecting angular ceiling structure, lone swimmer doing laps in early morning golden hour, steam rising from water surface, dramatic light rays through high windows, cinematic wide shot, raytracing global illumination, hand-painted watercolor texture, visible brushstrokes, Studio Ghibli architectural style, melancholic atmosphere, soft cyan and warm concrete gray color palette, architectural visualization render but with frame-by-frame animation aesthetics, Unreal Engine 5 rendering quality