The poem opens with the old myth that Zeus split humans in two, leaving each half to wander in search of the other. The speaker uses that story to talk about her own love, but with a twist. She wonders if she was born as less than a half, more broken than the myth allows. Yet being held by her partner leaves her feeling "more than whole," not merely repaired.
As the poem goes on, the line between two people fades. The speaker says she can't find any difference between them, and the "jagged edges of empty space" suggest the gaps in her that now seem to fit with someone else. In the last stanza, sleeping in an embrace, she feels no sense of "other." The closing line, "Alone, but with another," holds a quiet paradox: she stays herself while no longer feeling separate. The mood is tender, calm, and deeply content.