American artist Alexander Calder reshaped and redefined modern art through his unique sculptural technique of bending and twisting wire to create three-dimensional “drawings in space.” Calder's mobiles, a term coined by Marcel Duchamp, displayed these abstracted shapes made of industrial materials, constructed into lyrical, graceful, and often times colorful forms, hang in perfect balance. Calder's early mobiles were moved by motors, but later on he abandoned these mechanics and relied on air currents and human interaction to move his pieces. Over the course of seven decades, Calder expanded his work beyond mobiles to paintings, works on paper, stabiles, standing mobiles and monumental outdoor sculptures, among other objects and items. Calder's works were based in his belief that “art is the disparity that exists between form, masses and movement.”