Is this excerpt from "a birthday" by christina rossetti an example of a simile, a metaphor, or an analogy? my heart is like a singing bird whose nest is in a water'd shoot; my heart is like an apple-tree whose boughs are bent with thick-set fruit it is a metaphor because it compares two dissimilar entities. it is a simile because it reflects a direct comparison between two things. it is an analogy because it emphasizes the understated similarity. it is an analogy because it compares two pairs of corresponding elements of two things.