Imagine you're floating down a lazy river, whose banks disclose scene after scene, some comic, some serious. You are Alice, and the river is in Wonderland, except that the characters parody opera rather than Victorian poetry. For the best experience, let yourself drift, as in a dream, and go early to get a seat in the front row. The stage in the Arts Umbrella Theatre isn't raised, so rows further back will miss some scenes played close to the ground.