NEW YORK — An abstract masterpiece by a Mexican artist that was found in the trash by a woman who knew little about modern art has been sold for more than $1 million. The painting "Tres Personajes" by Rufino Tamayo was discovered in 2003 by Elizabeth Gibson, who spotted it on her morning walk on Manhattan's Upper West Side. She said she took it home because "even though I didn't understand it, I knew it had power." The brightly colored abstract work was purchased for $1,049,000 by an unidentified private American collector bidding by phone at Sotheby's Latin American Art...