A wall drawing of Keith Haring’s signature “Radiant Baby” is coming to auction. Haring drew the figure, a crawling infant surrounded by a halo, in gold marker above a light switch on the wall of his childhood bedroom in his hometown of Kutztown, Pennsylvania. The drawing will hit the auction block on September 14, when it will be offered as part of a postwar and contemporary art sale at the New Jersey auction house Rago/Wright’s. The drawing, which measures 5 inches in height, will be offered for sale still affixed to a portion of the blue wall on which it...