And his comfortable chair. In fact, the enduring nature of this conversation was starting to make the old witch suspicious. This fellow certainly didn't seem like the sort to talk to him ordinarily, so perhaps he could, after all, see the comforts Slughorn had reserved for himself outside of the sights of mortal eyes?

"Nonsense," Slughorn said, waving a hand airily as he kept a closer watch on the boy from beneath an absently cheerful expression. "I'm like a goldfish. Only grow to the limit of my environment. Otherwise I'd never fit in the chairs here... even if the stools are off-limits."