The enamelled decoration on the lamps is restricted to lettering, scrolls and conventional foliage; on other objects figure-subjects of all descriptions are freely used.
The enamelling process was probably introduced in the early part of the 13th century; most of the enamelled mosque lamps belong to the 14th century.
Interior courts are of Maryland granite and white enamelled bricks.
The "Luck of Eden Hall," which has been celebrated in a ballad by the duke of Wharton, and in a second ballad written by Uhland, the German poet, and translated by Longfellow, is an enamelled goblet, kept in a leathern case dating from the times of Henry IV.
Brazil's chief industrial importance is due to its situation in the heart of the "Brazil block" coal (so named because it naturally breaks into almost perfect rectangular blocks) and clay and shale region; among its manufactures are mining machinery and tools, boilers, paving and enamelled building bricks, hollow bricks, tiles, conduits, sewer-pipe and pottery.