Pablo Picasso? Leonard Lyons? Daniel-Henry Kahnweiler? Arthur Koestler? Marshall McLuhan? Apocryphal? Dear Quote Investigator: The most fascinating anecdote about authenticity that I have ever heard features Pablo Picasso repudiating a painting that he apparently created. Are you familiar with this tale? Would you please explore its provenance? Quote Investigator: The earliest occurrence of this anecdote …