Talent, long study, and much hard work produce great art, ordinarily the work of a single person. On the other hand, elements of greatness sometimes find each other, meld, and produce beauty greater than the sum of the parts. So it is with Winged Clouds and Cobalt Skies. Three artists, Frank Reaugh, Lucretia Donnell, and her mother Lucretia, united their talents to do what all great art does: enrich the culture and the lives of others. From 1889...