portuguese pavement known as calçada portuguesa made of small white-red-black stones in mosaic pattern with stop sign and

alley ancient arrangement art artistic black calã§ada centre cobbled cobblestone construction craft cube decoration flat flooring geometric handicraft historic horizontal interstice lagos mall mosaic motif orange pattern pavement pedestrian piece portugal portuguesa portuguese red rua sidewalk sign small spot square stone stones stop street strolling tessellation tile tourism touristic traditionalstyle vernacular walking walkway white white-red-black yellowish