This material was used for both I Have Been to the Mountain in the MLK Reflection Park and Hero Construction by Richard Hunt. Dia Beacon and the Guggenheim Bilbao dedicate large rooms to Torqued Ellipses of this material. Before dying in a 1965 car crash, an abstract expressionist sculptor used this material for the Agricola (10[1])and Cubi series. A debate over public art ended in federal workers forcing the removal of a slab of this material from Foley (-5[1])Square. (10[1]-5[1])This favorite material of David Smith makes up large site-specific pieces like Tilted Arc by Richard Serra. An artist painted this material vermillion for an (10[1])arcing sculpture at Chicago’s Federal Plaza (10[1])titled Flamingo. For 10 points, the monumental “stabiles” of Alexander Calder are welded together from the COR-TEN type of what (10[1]-5[1])metal? ■END■ (10[1]0[2])