Permanent structures made of wood, brick, and stone could be built.
All the ancient civilizations probably developed in much the same way, in spite of regional and climatic differences. As villages grew, the accumulation of more numerous and substantial goods became possible. Heavier pottery replaced animal-skin gourds as containers for food and liquids. Cloth could be woven from wool and flax. Permanent structures made of wood, brick, and stone could be built.