A team of specialist researchers at the University of London have developed a new sub-discipline of architecture, reconstructing buildings after conflict or catastrophe. Forensic Architecture creates online models which are used in court. Their work is also exhibited for public viewing. The New York Times adopted the agency's methods in its reporting of the 2017 mass shooting in Las Vegas. The agency has made such a mark that it is on the shortlist for this year's Turner prize for visual art. Sarah Nankivell explains the art of Forensic Architecture.