Museums in the 21st century : concepts, projects, buildings ; [catalogue is published on the ocassion of the exhibition Museums in 21st century: ideas, projects, buildings 1. April - 25. June 2006 K20 Kunstsammlung Nordrhein-Westfalen, Düsseldorf; 21. September 2006 - 29. October 2006 MAXXI, Museo Nazionale delle Arti del XXI Secolo, Rom; 23. November 2006 - 19. February 2007 Lentos Kunstmuseum Linz ...29. May 2009 - 23. August 2009 Frist Center for the Visual Arts