#the little circle of candelight loosely called the universe

The fact is that the minds of wizards can give thoughts a shape. Witches normally work with what actually exists in the world, but a wizard can, if he’s good enough, put flesh on his imagination. This wouldn’t cause any trouble if it wasn’t for the fact that the little circle of candlelight loosely called “the universe of time and space” is adrift in something much more unpleasant and unpredictable.

Terry Pratchett, Equal Rites