With the allusive leaps and improvisational chops of a jazz soloist, Yusef Komunyakaa is our great poet of connectivity--the secret blood that links slave and master, explorer and native, stranger and brother. In Taboo he examines the role of blacks in Western history, and how these roles are portrayed in art and literature. In taut, meticulously crafted three-line stanzas, Rubens paints his wife looking longingly at a black servant; Aphra...