Where are they coming from?
Don't know the system really. Sometimes they leave from Fawkner Park. We often see them take off. We have seen them land there too. This one landed on the Junction Oval I think. As for the house balloon, R said he has seen it before. I think they are rotated around Australia, but not Sydney. Forget why, but no balloon flights in Sydney. Hope I have covered all aspects of where they are coming from. Oh, literally, probably Made in China.
Whenever I wish I was young again, I am sobered by memories of algebra.