Great Art! At press time, two major pieces of art at galleries in London and New York City were basically holes in the floors of the buildings, yet were the subjects of glowing reviews. Doris Salcedo's "Shibboleth," a large crack in the floor of a hall at London's Tate Modern (on which at least 15 people have suffered minor injuries after tripping) is said to symbolize racial and class divisions in society.











