The World and the Bo TreeEach time I leave home I seem to go in search of somethingcall it a bo tree, or Shangri La, or paradisewhich is only another name for peace itself and these days decidedly a fools errand. So writes Helen Bevington in The World and the Bo Tree, a book that describes her travels taken amid the turbulence of the 1980s. The world of the title is the one everybody knows, a fairly troubled, even threatening place to inhabit these days. The bo tree, which