This critical work considers the role played by elements that might be considered aberrational in a poet's oeuvre. With an introductory essay exploring the nature of aberration, these fourteen contributions investigate the work of major 20th-century poets from the U.S., Britain, Ireland, Australia and New Zealand. Aberration is considered from the standpoint of both the artist and the audience, prompting discussion on a range of important issues, including the formation of the canon. Each essay discusses the status of the aberrant work and the ways in which it challenges, enlarges or supports the overall perception of the poet.