Workers clean the tree-like stainless steel sculpture 'Inversion' by U.S. artist Roxy Paine, installed in the Art Garden of the Israel Museum in Jerusalem Jan 25, 2011. The 42-feet-high and 35-foot-wide sculpture was hand-wrought through a fabrication process that welded together more than 7,000 metal plate, pipe and rod elements, the museum's press officer said. [Photo/Agencies]