Among art sleuths, nothing raises the after-dinner pulse like, a good tale of a masterpiece rediscovered in an atticunless it is a tale of one hung in full view for decades but unrecognized until the right eye spotted it. Last week the art world enjoyed both kinds of discovery.
In Spain, Valencia's City Councilman Vincente Giner Guillot had nursed a private ambition for more than 20 years: to be the one to discover the missing one of three El Grecos that, legend said, once belonged to Valencia's 350-year-old Real Colegio del Corpus Christi. Councilman Guillot's main problem was that he knew nothing...