What is an example of symbolism in the poem, After Great Pain, a Formal Feeling Comes?

Tombs symbolize the ceremonies associated with death. The speaker says that, after trauma, "The Nerves sit ceremonious, like Tombs –" (2), likening the nerves of the body to headstones in a cemetery. This word choice is significant because it invites the reader to think about grief as death – a correlation that will reappear at the end of the poem – but focuses instead on the burial process and the ceremonies associated with loss rather than death itself.