In romeo and Juliet, romeo is trying to say that Juliet is the sun, (she is bright like the sun), that is the metaphor. “But, soft! what light through yonder window breaks. It is the east, and Juliet is the sun. Arise, fair sun, and kill the envious moon, Who is already sick and pale with grief” In describing Juliet as the sun. Romeo is trying to suggest that the good things of being with Juliet is that she is very bright,(she is romeos source of light) and metaphorically, (she is the sun, she is warm and beautiful like the sun).