He told me never to touch the empty frame at the end of the gallery. And yet lately, that's the only spot without a speck of dust.

• GrahamI saw it on my way in for a house call. He stands there every night.
  OsmonWhatever you saw, doctor, you saw nothing.
• PaulineI run past that hallway every time.
  OsmonDon't run. That floor is older than I am.