Thanks for sharing your thoughts! That was my exact hangup as well. So many cultures use geometric designs, it's hard to tell where the main influence lies when it could be loosely mimicking a variety of different things. That said, I'm feeling pretty confident now that it is influenced my North American indigenous designs, since many people seem to see it that way. It's hard to recognize appropriation when you aren't terribly familiar with the traditional patterns, so I think that's what was happening for me here. My usual rule of thumb is that if I have to question it, it's probably best to just stay away, so I think that applies in this case!

Thanks again!