Cities

The city represents the **center** of economic growth and technological advances and cultural production. It is part of us. It defines our **lives**, our **traditions** and our **language**. Man is a social and political animal; this supports the fact that the cities began due to the **needs of people** to get food, group protection and form relationships with others members of the same species. The first cities where clearly defined with walls. Nowadays, these boundaries are represented in a “virtual” way.  A **well organized** city must cover several needs: living, working, studying, recreating, and many more. It is a complex system because it has both good and bad things: **communication, pollution, poverty, people, money, public spaces and green areas**. All of this must be considered and covered to guarantee the life of millions of people. In the last decades, due to the overpopulation, professionals have invented a new system: **sustainable cities**. This new cities are based on three fundamental elements: **economy, ecology and equity**. They pursue what we call **COMMONWEALTH**, a good life for everybody.

