In Romeo and Juliet Shakespeare uses a lot of metaphors in his work, he uses a lot of words that you wouldn’t use that have different meanings.In a speech by mercutio he goes on to say “Begot of nothing but vain fantasy,
Which is as thin of substance as the air” ., this means that his head is in the clouds probably saying he is nieve , saying that fantasy is as thin as air is basically saying that you shouldn’t trust your fantasy and stay I the real world because thou won’t do no good up there in your own little world. In this paragraph mercutio is trying to talk sense Into Romeo and trying to snap out of it.
React!