There, he collapses backward as Stravinsky's final, bleating note cues the escape from within the proscenium space of a silky wisp of pure-white fabric, sending it like a comet into the auditorium ceiling.

WSJ: A Puppeteer's 'Rite' of Passage | Basil Twist | By Robert Greskovic

Note the caveat: there must be an escape valve.

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