You’re indoors in the sense that you’re protected from the weather and the elements, and the cave could even have some kind of covering or entrance area that could be considered a door or doorway. People have built homes in caves.
Is caving an outside, inside activity?
Tbf the root of door dates to when it was most likely the hole in the hut you walked in through
Door don’t have roots, you’re thinking of a tree or maybe shrubbery.
Shrubbery! I heard some lot galloping by with coconuts looking for a shrubbery!
Ni! Ni!