In the Imperial Age, the poorer Roman houses were built of sun-dried brick. These houses only had one room. In this one room the family slept, ate, and had visitors. Richer people had mansions. Statues and paintings were shown. Small rooms were used as living and dining places. In the center there was a court with a garden. It was decorated with fountains, plants, and flowers. Floors were often made of mosaics, tiles, or marble with lots of different colors. Some walls were painted. Dishes were made of pottery or glass. There was plumbing in some houses and in the public baths, and a sewer system was used. Hot air warmed the house from a heating system. Many rich Romans had two houses, one in the town and one in the country.