Grain by grain, a Tibetan Sand Mandala took shape at the King Hooper Mansion last weekend. In an event hosted by the Marblehead Arts Association, Geshe Gendun Gyatso, a Tibetan Monk and trained Mandala master, spent four days crafting an intricate sand painting dedicated to world peace. Layers of gem-colored sand were placed on a four-foot circle and were "infused with prayers and meditation, to form a breathtakingly beautiful symbolic design of the universe," according to a release issued by the association. Gyatso’s goals in creating mandalas are "to inform and enlighten people to the path …