Zellij is amongst the first glazed mosaic tiles used in buildings as floor and wall coverings. It is 100 percent handmade glazed ceramic tile and mosaics, using nothing but natural sun, kiln fire, clay, pigments, and hand forged steel chisels to cut the Zellij into mosaic shapes. Many historic buildings in both Morocco and Spain display extensive and lavish use of Zellij inside with intricate shapes and designs, and elaborate lively gardens. Alhambra - WikipediaAlcázar of Seville - WikipediaBen Youssef Madrasa - Wikipedia