A comparison that is made directly (for example, John Keats’s “Beauty is truth, truth beauty” from “Ode on a Grecian Urn”) or less directly, but in any case without pointing out a similarity by using words such as “like,” “as,” or “than.” See Sylvia Plath’s description of her dead father as “Marble-heavy, a bag full of God” in “Daddy" or Emily Dickinson’s “‘Hope’ is the thing with feathers— / That perches in the soul—" as examples.