In "Structures of Rime," the open series begun in The Opening of the Field and continued in this volume, Duncan works with ideas, forces, and persons created in language itself--the life and identity of the poet in the poem. With the first thirty poems of "Passages," which form the structural base in Bending the Bow, he has begun a second open series--a multiphasic projection of movements in a field, an imagined universe of the poem that moves out...