The image of the prism, with its multiple refractions, offers some sense of the inexhaustible variety of a work of art. Like a prism, King Lear is attractive; like a prism, it is a multiply shaped thing; like a prism, it is an object of admiration, as well as an instrument of analysis. The essays in this book - forming neither a casebook nor a 'perplex' - were written because their authors wanted to understand something specific about...