the background of the sound-absorbing plate is gray with solid perforations in the form of holes, construction, texture

absorbing abstract alphabet antique architectural art backdrop background backgrounds black building clay clouds construction cover decor decoration decorative design element endless forging form gear geometric graphic gray grey grid grill hole holes home house industrial iron letter letters material mesh metal metallic ornament ornamental ornate pattern perforated perforations plate protection repair seamless shape silver solid sound stage steel surface symmetry textile texture textured textures tiled vintage wallpaper