The art of tile making: the "clay paste" is silica, alumna, lime, and alkali. It is made into a paste and poured into molds. The Tile Mosaics were created by taking the glazed tiles and scoring them then using a chisel to cut them with a bevel (the back of the tile has less surface area). They were places on a flat surface face down in their desired pattern and plaster is poured over their backs. Another technique is tile inlay, where the tiles are inlayed into a wall of plaster. This technique leaves the white plaster around each tile visible.