Balloons are only useful in atmosphere.
Do you want to have some hot air balloons flying around in the Castle enclosure?
I would be a little challenging, without normal circulation patterns, but it would be a lovely sight, wouldn't it?
Oh....I think I need to go to bed early tonight...my mind was conjuring something else...this is wierd...Hot air balloons in the castle? They'd have to be small, wouldn't they? Like the dragonettes?