in this yawning abyss of a puzzle reverberate in a fragmented looking glass through contrasting images -- DUALROLES (3A. Versatile actors may play them) and CYRANO (45D. Edmond Rostand hero); MIRROR (20A. Ape) and ISEEIT (55A Spotter's confirmation); EMAJOR (18A. Key that doesn't include 58-Across) and ASHARP (58A. It's almost a