NOTHING IS QUITE as it seems when you pass through the looking glass into the fiscal fantasyland where Donald Trump resides. His 26th-floor office in Manhattan’s Trump Tower is really only 18 floors above Fifth Avenue. In this arena of marble and mirrors, where hype and high finance somehow blend into one, the difference between a billionaire and a bankrupt turns out to be a measly $20 million. That is the sum Trump’s banks lent him in June, saving him at the last possible moment from a default that could have demolished his empire.