I apologize for tossing around the obscure technical terms. It's a fairly new word for the old concept. Anthropologists decided that we should have a name for it, and once I saw it in a journal a few years back I became quite taken with it.

The skeleton motif is the most common, and was the most mysterious up until a few months ago. Spiders feature heavily, and other native animals. Interestingly, there are no depictions of warfare or fighting among anything we've found. A most unmilitaristic race. Rare, in my experience.

But the strangest icon of all was one that I saw in a temple. It was a figure, long and emaciated of limb, and burning eyes like a demon from the infernal reaches. I've never seen anything like it among the artifacts, before or since. It was terrible to behold.