Architecture is conventionally seen as being synonymous with building. In contrast, this book introduces and defines a new category - the unbuildable. The unbuildable involves projects that are not just unbuilt, but cannot be built. This distinct form of architectural project has an important and often surprising role in architectural discourse, working not in opposition to the buildable, but frequently complementing it.

Using well-known examples of early Soviet architecture - Tatlin's Tower in particular - Nerma Cridge demonstrates the relevance of the unbuildable, how it...