From a table beneath a lovely gas lamp (gas lamps, the things that people do come up with!), Prospero catches sight of Duo,
walking across the room. The old man leans forward and says Duo's name, then, in a whisper that fastens to an updraft and flows to dance somewhere about the sides of Duo's ears.
--earthofmyfatherswaterofmymotherswindofmyspiritfireofmyheart, come, come, attend, attend--
Prospero leans back and waits for the boy to come near.
He's due a reward for being such a diligent student, after all.