Montaigne's Essays are rightfully studied as giving birth to the literary form of that name. Ann Hartle's Montaigne and the Origins of Modern Philosophy argues that the essay is actually the perfect expression of Montaigne as what he called "a new figure: an unpremeditated and accidental philosopher." Unpremeditated philosophy is philosophy made sociable--brought down from the heavens to the street, where it might be engaged in by...