A visitor passes the 1992 work 'Untitled' (showing a bent street lamp) by German artist Martin Kippenberger (1953-1997), on display at the exhibition 'Martin Kippenberger Sehr Gut / Very Good' at Berlin's Hamburger Bahnhof museum for contemporary art on February 21, 2013. The exhibition, a retrospective of the artist's prolific and varied output opens from February 23 to August 18, 2013.