If Chicago Mayor Rahm Emanuel gets his way, when visitors peer into the silvery curvature of Millennium Park’s Cloud Gate, they will see the world. The mayor recently challenged Chicago tourism officials to bring 50 million tourists a year to his city by 2020, which would represent a 25 percent increase over the current figure. More critically, as reported in the Chicago Sun-Times, he wants Chicago to raise its profile by finding ways to attract a far larger share of international tourists than its current paltry 4.3 percent. With three recent additions, Chicago now maintains eight international tourism offices worldwide, still well short of several other major American cities. It even has its own official tourism theme song, although, as the Huffington Post notes,…