Minoan civilization especially the sequence of ceramic styles, have been used by archaeologists to define the three phases of Minoan culture (EM, MM, LM). Since wood and textiles have decomposed, the best-preserved (and most instructive) surviving examples of Minoan art are its pottery, palace architecture (with frescos which include landscapes), stone carvings and intricately-carved seal stones. Frescoes were the primary art form of Minoan culture. They include many depictions of people, with sexes distinguished by color; the men's skin is reddish-brown, and the women's white. Several frescoes at Knossos and Santorini survive. In contrast to Egyptian frescoes, Crete had true frescoes. Probably
Minoan civilization among the most well-supported examples known. Because their language has yet to be deciphered, it is unknown what kind of government was practiced by the Minoans, though the palaces and throne rooms indicate a form of hierarchy. A fresco of saffron-gatherers at Santorini is well-known. The Minoan trade in saffron, the stigma of a naturally-mutated crocus which originated in the Aegean basin, has left few material remains. According to Evans, the saffron (a sizable Minoan industry) was used for dye. Other archaeologists emphasize durable trade items: ceramics, copper, tin, gold and silver. The saffron may have had a religious significance.