Douglas Grace talks about his ideal city of the future : I see the city of the future in three zones( 区域 ) — inner( 内部 ), middle and outer. In the inner zone there will be no private cars. Public transport will be free and there will only be ambulances( 急救车 ), fire engines, taxis and police cars. This inner zone will be the residential( 住宅的 ) and recreational area of the city. People will live there and go out to enjoy themselves — to cinemas and restaurants. There will be parks and open spaces, trees and lakes, schools and universities. This way, when people are at home, they can go out easily and safely. Just outside the inner zone there will be big car parks for all private cars. The banks and most of the shops and hospitals will be in the middle zone. These are things that people don't need every day. All the factories and offices will be in the outer zone. People will travel out of the center to work, and back to the center in the evenings. The inner zone will be cleaner and better to live in and there will be more space for industry on the outside. This is my ideal city of the future — a very beautiful place! But I don't really think things will ever be like that!