Architecture and urbanism seem to be »weak« disciplines, constantly struggling for a better understanding of their nature and disciplinary borders. The huge amount of metaphors appearing in the discourse of both not only reference to their creative nature but also indicate their weakness and the missing piece strengthening their own understanding: a definition of space for architecture and of city for urbanism. But using metaphors in this field implies a problem – though metaphors achieve to bring opposites together, there remains the question how literal they can actually become in order to relate to these subjects properly. In this volume, several authors from various fields using different approaches discuss this question.