Mobiles are often associated with Alexander Calder, third in a family lineage of sculptors, who began experimenting with hanging wire constructions in the mid to late 1920's. He fully developed the idea of a mobile as a kinetic assemblage that sculpts space. Calder's early kinetic sculptures were very abstract motorized constructions, plays on mechanical models of the solar system whose planets and moons would carve circles out of space as they spun about each each other. Many don't know that Marcel Duchamp gave the name "mobiles" to Calder's wild constructions in 1931. Soon after that, Calder abandoned motors and began exploring wind powered mobiles, building very delicate wire sculptures with metal sails to catch the breeze.