Picture Fifth Avenue in Manhattan the stretch of road where the Macy's parade is held each Thanksgiving Day. Imagine that one spring day a kind of makeshift parade is being staged along upper Fifth Avenue near Central Park. But this is not the Macy's parade, not by a long shot. This is a relatively small affair: no floats, no ticker tape, no giant balloon figures floating down the street. It's just a crowd of people waving some tree branches and throwing their coats into the road. At the center of it all is a modest, average looking fellow astride a donkey's colt which actually is too small for him to ride with any kind of dignity.

But the members of the parade entourage are nothing if not jubilantly excited. E…