Thinking about how to translate 'がらんどう' brings to mind those vast, empty spaces that somehow feel both lonely and full of potential. The word 'hollow' captures the physical emptiness, but misses the echoing quality. 'Desolate' leans too heavily into sadness, while 'void' feels too cosmic. Maybe 'echoing emptiness' comes closest—that peculiar mix of space and sound you find in abandoned train stations at dawn.
There's a scene in 'Haibane Renmei' where the old schoolhouse perfectly embodies this feeling—walls whispering with ghosts of laughter, yet achingly empty now. English struggles with these nuanced absences, but that's what makes translation such an intriguing puzzle. Sometimes you need to borrow the Japanese word and let context do the work.