Phonetically speaking, it's the French word for water (eau). With a lithe international cast performing in, on and above water, Cirque du Soleil's O tells the tale of theater through the ages. It's a spectacular feat of imagination and engineering, and you'll pay dearly to see it – it's one of the Strip's few shows that rarely sells discounted tickets.
Children less than 18 years old must be accompanied by an adult; those under five are not allowed into the theater.