In The Yard, Diocletian Caelum is known as a Cane Corso who is thoughtful, slow to speak, and absolutely the last word in any room. Diocletian Caelum arranges seeds, beads, and bones into shapes the elders recognise. There is a corner of the flying den roof where Diocletian Caelum is unofficially assumed to be in charge of nothing in particular. Diocletian Caelum would like to outlive the sleeping machine rooms just long enough to leave it tidier than it was.