A long-lost painting by Elizabeth Murray is back before the public more than four decades after it vanished from view. The 1977 work, titled 'Bob', is the second-largest canvas the American painter ever produced. It had hung, hidden away, at the Burroughs Wellcome headquarters in North Carolina, where hardly anyone outside the company ever saw it. When the building was being torn down, the painting was knocked from its wall and fell to the ground, breaking apart. A company executive stepped in, saved the wreckage and kept it from ending up as rubble. Conservators then spent more than a year repairing tears and rebuilding the crushed surface. The restored work now hangs in the Great Hall of the Nasher Museum in Durham, where visitors can take in its full scale. For anyone tracking Murray's ambitious late-seventies period, the return of 'Bob' fills a real gap.