Locate on map Untitled by Rudolf Stingel Italian artist Rudolf Stingel often invites audiences to interact with his work, extending the artistic process and allowing his artwork to develop as ‘collaborations’. Since the 1980s, Stingel has been interrogating the medium by seeking audience participation in his projects using unlikely materials to question notions of authenticity and hierarchy. Casting and plating graffiti covered insulation panels has become one of Stingel’s acclaimed styles since early 2007. His latest addition to the airport celebrates and honors all the workers who helped build the airport. Signatures and initials of some workers are engraved in the body of the artwork.