The Calder Sidewalk The Legendary Sculptor’s Immobile Creation in Rustic Terrazzo Alexander Calder is best known for his abstract mobiles. There are also his stabiles (as his nonmoving sculptures came to be known). Then there’s his sidewalk. The 75-foot piece of permanent sidewalk art is always on view, where it was first installed in 1970, stretched out in front of three avant-garde art galleries on Manhattan’s Upper East Side. The sidewalk, with its abstract design, was created late in Calder’