Talk:Unfinished/@comment-4084782-20111213223007/@comment-14678137-20190916231918

Apparently there's an obscure 1903 novel called Journeys to the Planet Mars by Sara Weiss (I just learned about it today), and there was a sort of hot air balloon on the cover.

Considering Arthur referenced an old song like "In the Good Old Summertime" before, it could very well be that.