The first Sumerian houses were built with reeds, but as cities began to develop and flourish, people began building houses with mud bricks. Mesopotamia had several literatures written in cuneiform that included prayers and myths, and the Epic of Gilgamesh was the most famous poem that "predated the biblical story of Noah's Ark" ("Ancient"). Mesopotamia was also known for art and figures carved in stone and clay that usually depicted animals such as goats, rams, and bulls. Houses in the Indus Valley were made of burnt bricks and were usually two stories high. The houses had private bathrooms that included clay pipes that connected to sewers under the streets. The Indus Valley emphasized music and people were required to recite the Vedas, which contained the oldest recorded history