Robert Morris's walk-in "Labyrinth" and 25-by-33-foot "Aluminum I-Beams Construction" and a floor piece by Carl Andre also fit handily, as does Claes Oldenburg's Brobdingnagian, brilliant-red "Knife Ship, " its motorized oars rowing and its knifeblades rising and lowering at the gallery's far end.
Close to Spion Kop, a stone quarry spills across the track where you can search through the stones to find the remnants of flint spearheads and knife-blades made by the Ngaro people thousands of years ago.