If you believe, clap your hands

The audience is asked to save a life, out loud, and every night it does. Peter Pan premiered at the Duke of York's Theatre on 27 December 1904, produced by Charles Frohman, with Gerald du Maurier doubling as Captain Hook and Mr. Darling and Nina Boucicault in the title role - a woman as the boy, which then became the tradition. Near the end, Tinker Bell drinks the poison that was meant for Peter, and Peter turns outward, to 'the boys and girls of whom he is not one': 'Do you believe in fairies? Say quick that you believe! If you believe, clap your hands!' The published text carries the result as a stage direction - many clap, some don't, a few hiss, but Tink is saved - and Barrie had not trusted the audience to produce it: members of the orchestra were stationed to clap if the public declined, which a Smithsonian centenary account calls 'an unnecessary precaution'. The fourth wall is not broken here; it is made load-bearing. For one minute a night, the survival of a fiction depends on real strangers in a real room choosing to believe in public - the one moment in this corpus when the audience's feeling is not inferred from sales or letters but is itself the plot. And the gesture outlived the production it was written for: clapping for Tinker Bell is now a habit of the theatre rather than a request from a stage. The clap is not a metaphor for belonging. It is the price of the ticket, paid in belief, with the house lights down.