"Timothy Brook's award-winning Vermeer's Hat unfolded the early history of globalization, using Vermeer's paintings to show how objects like beaver hats and porcelain bowls began to circulate around the world. Now he plumbs the mystery of a single artifact that offers new insights into global connections centuries old.In 2009, an extraordinary map of China was discovered in Oxford's Bodleian Library--where it had first been deposited 350 years before,...