JOSEPH YAEGER has answered the call. Once a cheesemon- ger and aspiring writer, the young American picked up a method usually reserved for the Sunday painter: the art of watercolor. Applied to thickly gessoed canvases, his “dispatches from nowhere” have made quite the splash or two. BLAU meets a man whose discern- ing eye for the iconic and sure hand for the wet produce the most unexpected of objects. How can painting that’s so feverishly light be- come so sculpturally sound?