清水混凝土的真实：模板、气泡与色差

Create a close architectural visualisation of fair-faced concrete rendered with real material honesty rather than as a flat grey plane. Show the surface carrying every trace of its making: the horizontal board or panel joints at their true module, the form-tie holes on a strict grid with their conical recesses and the plugs slightly recessed, and a fine seam where two pours met with a barely visible colour difference between them. Detail the imperfections that make concrete read as concrete — small blowholes scattered unevenly and clustered near the top of each pour, a faint honeycomb at one bottom corner, a light dusting of efflorescence, and a slight variation in tone across the panel. Show the weathering as directional: a darker streak below a projecting sill where water has run, and a cleaner band beneath the overhang. Detail the light as low and raking so every board mark and tie hole casts a shadow. Photorealistic, tactile, grey with subtle variation, close three-quarter view.