Unlike most works by the sculptor of Flamingo, it was not used to make Lobster Trap and Fish Tail.
This material was adopted to make works like Black Cover Flat and Early One Morning after their artist met a sculptor who used this material to make Agricola I and the series Cubi. This main material of Anthony Caro and David Smith was used to make an untitled, longÂ­faced, 1967 sculpture that has functioned as a sort of jungle gym in Daley Plaza. In 1969, it was used to make the ironicallyÂ­named Grand Rapids sculpture La Grande (*) Vitesse. This material was used by Picasso to create his huge Chicago sculpture, and by Richard Serra to create Tilted Arc. A highly polished sculpture in this material has been nicknamed "the bean" and was made by Anish Kapoor. Unlike most works by the sculptor of Flamingo, it was not used to make Lobster Trap and Fish Tail. For 10 points, name this metal used to make most of the stabiles and mobiles of Alexander Calder.
This material was adopted to make works like Black Cover Flat and Early One Morning after their artist met a sculptor who used this material to make Agricola I and the series Cubi.
steel [accept more specific answers like stainless steel or CorTen; prompt on "metal" or "sheet metal"]