Conde Nast, the giant magazine publisher and owner of Vogue, has blocked British artist Graham Dolphin from showing a piece based on Vogue covers in a show at the Barbican Centre in London. The company said that “the reputation and goodwill built up in this title over many years as the world’s leading fashion authority, is the most valuable asset this company owns, and we are not prepared to allow anyone to exploit it in an unauthorised way…. It is our policy to follow up on every case of unauthorised usage whether it be commercial or artistic, with the assistance of our lawyers whenever necessary.”