This exciting and playful production succeeded in tearing down the theater’s well-known “fourth wall,” that invisible barrier separating the audience from the action, and it did so in multiple ways. First, there were the direct physical assaults, as when, in the opening number, Aaron Linker (who played the Music Hall Royale actor Mr. Clive Paget) and his character (the sinister choirmaster John Jasper) jumped off the stage and landed just before the front row, his leap perfectly timed to emphasize his self-assessment as “quite mad.”