“What’s it all about?”That’s the question many first-nighters asked Sunday after the Broadway preem of Tom Stoppard‘s “Jumpers.” At Tavern on the Green, the playwright wasn’t much help. “It’s a strange question to ask of any play,” Stoppard replied. Headliner Simon Russell Beale offered a little more help. “It fluctuates depending on the audience,” he said. Beale’s leading lady, Essie Davis, opined, “When man landed on the moon, it led to chaos.” And director David Leveaux chimed in, “There’s more to life than meets the eye.” Now that we’ve settled that, Leveaux revealed why he used a fake turtle in the show rather than the real thing: “Turtles are a protected species.” At least that much is clear.