At a point when ultra-advanced computer graphics are bringing an Oscar-worthy vitality to JRR Tolkien's Lord of the Rings, it is deeply cheering to see two fire-breathing bulls convincingly recreated with bits of bicycle, cigarettes and some empty paint-pots, and a famous ship built out of two upturned pub-tables and a ladder. There is no sense that the audience is being imaginatively shortchanged - on the contrary, as with all the best Christmas shows, it feels as if the crowd is whirled up into some great game where we're all in the same theatrical joke together.