In its own way, Grand Avenue in downtown Los Angeles is as strange and fantastical as the imaginary towns in Italo Calvino's Invisible Cities. One of the Italian novelist's inventions is Armilla, a city that consists of nothing but a forest of water pipes, where beautiful women shower. Another is Morlana, which has a gorgeous fa�ade of alabaster gates and coral columns, which hides a pile of trash. Yet another city is a sphere made up of twisted roads designed to prevent a woman from escaping....