>>1265292https://en.wikipedia.org/wiki/InuksukThey are typically used as landmarks, to denote locations or borders. If you are traveling across miles of indistinguishable forest or tundra or whatever, it helps to to create some kind of trail marker to more easily find your way back next time.
Getting upset about people stacking some rocks HAS to be autism, right? This is definitely one of the most trivial things I've seen anyone complain about on 4chan.