More than a half century ago, philosopher Isaiah Berlin wrote a little essay he called The Hedgehog and the Fox. The title is based on a line from the ancient Greek poet Archilochus, "The fox knows many things, but the hedgehog knows only one big thing." Berlin used this as an analogy for how different writers and thinkers approach the world. Plato and Dante, for example, were hedgehogs, always keeping within one overarching framework. William Shakespeare, on the other hand, was a fox, exploring many ideas and themes throughout his writing career.