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“A remarkable book capable of reshaping what one takes philosophy to be.”
—Cora Diamond, Kenan Professor of Philosophy Emerita, University of Virginia


Could there be a logical alien—a being whose ways of talking, inferring, and contradicting exhibit an entirely different logical shape than ours, yet who nonetheless is thinking? Could someone, contrary to the most basic rules of logic, think that two contradictory statements are both true at the same time? Such questions may seem outlandish, b...