Just trying to get some movement, maybe nudge someone toward an answer even if I don't get there.
I want to say "think cryptically" makes this more of a riddle. Obviously something that is not a living being can't be actually 'blind' but can 'lose sight/vision' in a figurative sense. "Not a living being" to me means a THING that is non-sentient, such as a statue or a mountain or a ship of some sort, but I suppose it could also mean an organization like the Night's Watch or the Kingsguard.