Models are supposed to have a purpose. They give you a way to better understand, visualise, stimulate etc. I don't think an isolated tribe would really have an

Models are supposed to have a purpose. They give you a way to better understand, visualise, stimulate etc. I don't think an isolated tribe would really have any need to create models in this way. And the curiousities of creation can be explained using myths and legends. Those kind of stories are more compelling and apparently useful than a mundane physical understanding or reality. Particularly when those people already have an intimate understanding of the physical world ingrained.