The classic hot air balloon with the round balloon and gas burner thing. It’s easy to see how it goes up or down, but how do people go where they want to – or get back!
Wind blows in different directions at different heights, apparently. Go up to north up a little more and it’s north east. Up a little more and its east. Up a lot and it’s south west. Down a whole lot and it’s south. Except with really complicated directions and stuff probably.
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