Julian Barbour’s obsession with time began on Oct. 18, 1963. The 26-year-old Cambridge graduate in mathematics was on a train to the Bavarian alps, where he and a friend planned to climb the Watzmann, Germany’s third highest peak. The newspaper in his hand contained a summary of a Scientific American article by British physicist Paul Dirac. “He questioned whether four-dimensional symmetries are a fundamental feature of the physical world,” Barbour recalled. Dirac was pulling apart Einstein’s conception of the three dimensions of space and one of time, looking for deeper truths. The next day, Barbour woke with a headache and told his friend he was in no state to climb. “I said, ‘You’ll have t
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