"That's precisely where he exceeded everyone else," Sun says, citing an anecdote in evidence. When Chang and Picasso met, Picasso showed him four paintings of his, one of which a was a fake, and asked him if he could tell which one it was.
「這就是老師的過人之處了」，孫家勤以一則軼事道出大師的「秘訣」所在：當年張大千與畢卡索會面時，畢卡索曾經出示四張自己的畫作，其中一張是品，要請大師鑑定。