Near Prospero Torretas I found a box that gives you a prompt to launch a balloon, which causes more balloons to be launched in the distance. It was really odd and kind of cryptic, and I don't think it was part of some event. I added this as trivia to the Prospero Torretas article a really long time ago before I had an account, but then never went back or made any attempt to document it further. I will probably check to see if it is still there, but has anyone else found that box or another like it? I should add that I was on PS4.