This poem by Dannie Abse describes an unnamed wall located in the countryside of Glamorgan, Wales. At first glance, the wall seems useless as it begins and ends for no apparent reason and has no other walls adjacent to it. However, the poem suggests the wall serves purposes like providing habitat for lichens and butterflies, and shelter for sheep. The poet's view of the wall changes from the first to last stanza, implying that what seems useless may have meaning from another perspective.