In keeping with summer tradition at the Joyce Theater, the dancer-gymnast-athletes of Pilobolus return with two programs, each featuring a New York premiere. The first of those, "On the Nature of Things," is a balancing act created and performed by three company members. "The Inconsistent Pedaler" (Program B) is a collaboration with the Israeli fiction writer Etgar Keret and the filmmaker Shira Geffen, revolving around a girl and her magic, time-bending bicycle.