A visitors inspects a light installation by British-born artist Anthony McCall during a preview of the exhibition «Anthoy McCall. Five Minutes of Pure Sculpture» at the Hamburger Bahnhof museum in Berlin on April 19, 2012. The exhibition on McCall’s projections, which he has been developing since the 1970s, opens its doors from April 20 to August 12, 2012. AFP PHOTO / STEPHANIE PILICK GERMANY OUT (Photo credit should read STEPHANIE PILICK/AFP/Getty Images) ORG XMIT: