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?
Some people live in huts or other types of human dwellings that don’t have entry doors. They have doorways.
When I was visiting the Philippines I saw homes on stilts that did not actually have doors, but I would certainly consider the inside of such a structure to be indoors. Pre-colonial architecture may not use a front door.
I recognize this isn’t a great argument, but it’s arguable I think in principle.
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You are consistent! I admire this.
Pedantically speaking, I have never been in a door. I’ve opened doors and passed beyond the portal they were blocking, but I have never phased into or been sealed inside of a door. :p
Tbf the root of door dates to when it was most likely the hole in the hut you walked in through
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Shrubbery! I heard some lot galloping by with coconuts looking for a shrubbery!
Ni! Ni!