What is the theme of brown chest by john updike?

In his poem, "The Brown Chest," John Updike explores the theme of longing for the return of a lost loved one. The loss of a loved one, the sense of emptiness left behind, and the persistent yearning for their return are all themes in the poem. The poem shows how the speaker is profoundly influenced by the loss and expresses their emotions of grief, anguish, and desire for reunification with the lost loved one.