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Floating Islands Should Be Weird: The Pastel Dungeon
(thepasteldungeon.blogspot.com)
Daily RPG blog roll brought to you courtesy of sly flourish: https://slyflourish.com/
There's no rule that a sky island has to be above the tree line. Even a modestly tall mountain's height would put it far out of reach from any society without materials or a design for a hot air balloon. After all, you cannot simply hike up to it.