Moroccan zellij (tiles) are prized around the world. The pieces are all handmade by painting clay squares of approx 1.5 inches depth with a polychrome glaze. This is fired, then cut into individual geometric pieces, which are then placed upside down on a unique pattern grid. The back is then covered in cement and the very heavy panel is cemented onto the wall or floor right-side up. Impossible to industrialize, it is one of the few truly artisanal decorations in the world today(km).