In the nineteen-twenties, while living in Paris, the artist Alexander Calder fashioned a miniature circus from commonplace materials (wire, cloth, bottle caps) which he used for putting on shows for avant-garde confrères (Miró, Duchamp, Mondrian). The other day, Stephen Glover, who does modern-day variety-show stunts (tightrope walking over an alligator pit, snorting wasabi, using a beehive as a tetherball) with his buddies (Knoxville, Danger Eren, Wee Man) as Steve-O in the “Jackass” franchise, sat in a darkened room in the Whitney Museum, watching a recording of one of Calder’s productions. Glover, a professionally trained circus clown, raised his eyebrows. “Every time I see Cirque du Soleil I find myself, like, tearing up,” he said, his familiar rasp lowered to a stage whisper. “I’m just so moved by how fucking incredible…