It is said that the skyline of a great city tells you a lot about its mood.  In times of wealth, it soars higher and higher, buildings compete to be the biggest and the best.  In bad times, the skyline stays cautiously still.  Yet just weeks after the Wall Street Crash of 1929 signaled the greatest economic recession of living memory, work started on what was for decades the world's tallest building.  This might have seemed a crazy project to go ahead with...more.