square mixed with triangle pattern of concrete ventilating wall

persepective view concrete pattern hole exterior wall architecture ventilation cement construction background square design texture building grey material structure textured block modern urban vent backdrop barrier outdoors gray industrial facade decorative cavity conditioning flow geometry grid horizontal monochrome outside panorama panoramic row shadow triangle window surface wallpaper air aperture home industry shape vintage architectural box decoration detail style brick vent rough simplicity continuity exhaust geometric repetition solid abstract close-up element empty isolated building seamless abstract backgrounds symetry white