About Alexander Calder:
Alexander Calder was an American sculptor known as the originator of the mobile, a type of moving sculpture made with delicately balanced or suspended shapes that move in response to touch or air currents. Calder’s monumental stationary sculptures are called stabiles. He also produced wire figures, which are like drawings made in space, and notably a miniature circus work that was performed by the artist.
Why must art be static? You look at an abstraction, sculptured or painted, an entirely exciting arrangement of planes, spheres, nuclei, entirely without meaning. It would be perfect, but it is always still. The next step in sculpture is motion.Alexander Calder