In the world of tile, there may be no more important work of architecture than Alhambra. The 14th century Moorish fortress in southern Spain is a marvel of geometry, not because of the building–which is in fact somewhat disjointed and lacking in a coherent overall plan–but because of the tile mosaics.

The mosaic patterns of the clay tile that adorns the walls of Alhambra are the foundational shapes of tile design.

And it goes without saying that the colors are timeless, in spite of their vibrancy.