Permanent Open Air Art Installations Photo: Dirk Rose Tim Etchells: Shifting Ground Installed on the exterior façade of PACT, Tim Etchells’ neon work ›Shifting Ground‹ invites the viewer to consider both literal and metaphorical meanings of the simple phrase. William Forsythe: Himmel & Hölle William Forsythe invites visitors to playfully interact with his choreographic object ›Himmel & Hölle‹.