O, whose name is pronounced the same way as "eau", (the French word for "water"), takes place in, around and above a 1.5 million-gallon pool of water, featuring acts such as synchronized swimming, aerial silks and fire dancing! Since opening in 1998, it has performed continuously to rave reviews, and has won various awards for technical excellence. If you are a fan of water acrobatics, this is the Cirque show for you!