I also noticed how there were only two stanzas in the poem. This I thought was interesting because the speaker is meant to be "between two rooms." The first stanza is the observation of the people in one room and the second stanza, is the speaker observing the people in the other room. The different language used in the second stanza and second room, helps make the two rooms even more of seperate worlds. Throughout these observations, the speaker seems to be comparing and contrasting both worlds.
Definition of Sonrisas: