>>149512420
Most martian cultures have an analogue on earth, at least in the case of the red and green men which both resemble native customs Burroughs had likely become familiar with through art galleries around the time. In many of these cases, it was meant to evoke a sense of ruggedness, perhaps a bit bestial and/or freeing depending on one's perspective. Hell, the greenies wearing foreign metalworks is literally taken from a cultural exchange between Europeans and members of the Woodland cultures.