Too many things in this world are unbalanced: budgets, our dinners most nights, Tatum O’Neal. So whenever we have a chance to witness balance in all its elegant, jawdropping glory, we hop to it. That opportunity is here. Cirque du Soleil — that troupe of bendy, graceful acrobats that’s as graceful as worldclass ballerinas, as mesmerizing as a vintage Coney Island freak show, and as gravity-defying as an eagle — is setting up their Big Top at the Bayside Expo Center (200 Mount Vernon Street, Boston, 617.474.6000). They spin upside-down! They contort! They impersonate pretzels! Their new show is called Kooza, a riff on the Sanskrit word for “box of treasure.” Go be dazzled. For tickets ($49.50 to $215), call 800.678.5440 or visit www.cirquedusoleil.com.