beneath cover covering glass glazed metal protection rain roof station diamond diamond plate iron meter meter cover object rectangle rust rusty shape steel texture abstract architectural backdrop background concrete construction contained covered design detail drain drainage draining grating gray grey grid grill grille heavy lattice lid lined lines maintenance metallic parallel pavement paving perspective sanitation solid square squared squares strength strong urban open-sided paved pedestrians people posts ribbing roofing rounded shelter support walking walkway color colour decorated Designs drains raised turtles