The strength and weaknesses of the West African economy can be seen by a cursory glance at a list of its main exports and imports. West African exports included gold, ivory, hides, leather goods, cotton, peppercorn, olive oil, and cola. While some of these items were only exported for short distances, others found their way over long distances. West African gold, for example, was exported as far away as Asia and Northern Europe. Some English coins of the period were minted with West African gold. West African imports included silks from Asia, swords, knives, kitchen-ware, and trinkets from the primitive industrial factories of Europe as well as horses and other items from Arabia. Two other items of trade became all important for the future--the exportation of slaves and the importation of guns and gunpowder. West African manufacturing demonstrated a considerable amount of skill in a wide variety of crafts. These included basket-weaving, pottery making, woodworking and iron-working. Archeological evidence shows that West Africans were making pottery and terracotta sculpture as much as two thousand years ago. Three-dimensional forms seem to have held a particular interest for West African artists. During the last century, art critics have gone beyond considering this art as "primitive" and have begun to appreciate its aesthetic qualities. In fact, in recent years, African art has had considerable influence on contemporary artists. The two forms of African art best known outside Africa are music and the dance. African music contrasts with European music in its use of a different scale and in concentrating less on melodic development and more on the creation of complex and subtle rhythmic patterns. Musicians used to view African music as simple and undeveloped, but now musicologists admit that African rhythms are more complex and highly developed than rhythms in European music. Africans like to sing and to develop songs for all occasions: religious songs, work songs, and songs for leisure. African singing is also marked by the frequent use of a leader and a chorus response technique. African dance, like its music, builds on highly complex rhythmic patterns. It too is closely related to all parts of the African's daily life. There are dances for social and for ritual occasions. The most common use of the dance was as an integral part of African religious rites.