Cities encourage proximity and diversity among people, goods, and information; they make possible meetings, co-operation, solidarity and the exchange of knowledge and ideas. They offer tools for commerce and the division of labour for the emancipation of different life styles. However, in order to benefit from this proximity and diversity, cities also need to be open. This paper aims to discuss and promote the spatial and social openness of cities. An open city allows equal access to available opportunities and resources, thus facilitating co-existence between different individuals and groups. The open city is not an abstract idea oriented toward philanthropy, but an urgent need in order to prepare our cities for future challenges and fully utilize their potential.
Keywords: Public city; urban shape; urban diversity