La Grande Vitesse by Alexander Calder is a steel sculpture. It was created by Alexander Calder in 1969, and is often simply referred to by locals as "The Calder'. The sculpture is consider stabile, which means a stationary sculpture that uses multiple flat planes to give the appearance of volume and movement. Calder first studied the architectural plans, scale, and materials of the buildings before building it. He designed a sculpture that responded well to the plaza and the surrounding architecture.
This is a video of sculpture:
Here is more personal history
Here more information about Alexander Calder: