O

The second entrant, in 1998, into Cirque’s Las Vegas empire, O still manages to astound in large part due to its unrivaled star: a spectacularly designed aquatic stage that transforms from solid ground to liquid often before the audience even notices. O makes the most of this defining feature with skits combining comedy, derring-do and whimsy that play out above, on and in the 1.5 million-gallon tank. Ships roll on temporary waves, divers plunge 60 feet into the waters, acrobats twirl and contort high above the stage below with the show’s abstract narrative weaving O into more than just the sum of its parts.