NEW YORK - The imperative of visionary logic goes like this: if the worldliness of the present world be false, then divest yourself of it, and precipitate a future that rings true. Russian-born Vasily Kandinsky (1866-1944) remains one of a few artists whose art is definitive in this sense, and so it is a major event when, as now, we are invited to view a retrospective meant to celebrate his singular art at the Guggenheim...