By Michael D. Schaffer / The Bulletin
February 3, 2013
“Leonardo and the Last Supper" by Ross King (Walker, 322 pgs., $28)
Leonardo da Vinci was a genius of delay, a master of the unfinished.
Brilliant ideas swirled around him like snowflakes in a flurry and melted almost as quickly. Frustrated patrons tried in vain to get him to complete....