The weaving of wicker work is one of the oldest arts known to man. The shoots of the willow or osier are mostly used. Ash, elm, and birch shoots are also used. Baskets are made of a great variety of shapes and sizes, and basket work is used for various other purposes, such as screens, chairs and pony carriages. Boats have been made of basket-work covered by skins, and the ancient Britons used basket shields.