- You may be looking for open space. Sky is open space (and appears as open space when looked at), but cannot exist underground.
Sky is represented by a mass of solid blue (cyan) tiles across the map. Sky only appears if there are two levels of successive open space below the current view, and there are no floors or constructions above the current view. A tile that has direct, vertical access to the sky (above the tile) is classified as outside (as opposed to inside). "Outside" tiles can cause sickness and vomiting in cave-adapted dwarves.
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Despite being suspended in the air, it's unlikely to fall down anytime soon. Even if you're a Gaul.
- "Sky allows horrible light to filter into outposts, and should be avoided at all costs." --Zulgar Zarethadil, Miner