I suppose the marking are a bit like veins under human skin. I have pretty transparent skin and my veins REALLY stand out on parts of me. Obviously the veins are the circularity system so the Na'vi spots follow or maybe have something to do with the workings of important bodily functions on them. I'd imagine that every human doesn't have every vein follow the exact position on every human body, but they do follow a general area. So the layout of my veins is a combination of genes from both parents same as Na'vi markings would be. Or maybe I just went in totally the wrong direction with that theory!
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