“Phi”—the title of Elisa Sighicelli’s latest, almost psychedelic exhibition—was a tremendously effective investigation of the disruptive power of light: light transformed, broken down into multicolored particles, projected, and filtered by backlit surfaces. Thus in Film without Film (all works 2006), some hundred or so bulbs, attached to the walls at a height of about three feet from the floor, flashed on and off in sequence, giving the impression of a light source that ran along the walls of one room in the gallery. The optical illusion produced by the successive appearance of the lights resulted