The square in the center of Siena, there are many intersections around to reach here, many people are here to play freely, sit on the square floor to bask in the sun and chat, because there is a certain slope, sitting does not feel uncomfortable, the square ground counts 9 parts, Expand like a shell or a fan. If it rains, the rain will concentrate on a sewer to the end. There are many pigeons in the fountain who are staying to drink water, and there are birds flying in the sky.