Boston’s Mayor Thomas Menino proposes a skyscraper in a place Robert Campbell calls the worst possible place for it. “The question we ought to be debating, perhaps, is whether we want to be America’s Florence or its Milan — a cultural and educational capital, or a business one. Or both? Exactly how much do we want to grow, anyway? And with what kind of growth cells? That’s a debate that should be public and vociferous.”