It seems an eternal distinction: sometimes people build, sometimes they destroy. However, since we have a concept of modernity, we also understand that building is very often based on sheer destruction. It is ‘the price of progress’. A new insight is now emerging: much destruction also has an agenda. It has a precision that reminds us of architecture. It has a formal dimension that reminds us of design. In this issue: explore the sinister creativity of Cities Unbuilt.