Critics have charged grown-ups who embrace the modern adult book coloring trend with being childish. Also, they allege that these books' successes are products of a dumbed-down culture. The trend may be a fad, but it also has a remarkable history worth remembering. We've chosen 40 images from a wide range of artists, including Hishikawa Moronobu, Albrecht D rer, Walter Crane, Jessie M. King, Aubrey Beardsley, among others. They...