This is like how we only know of the tiniest amount of dinosaurs because the ones we know of died in a Goldilocks zone of fossilisation and there’s likely tons of cool dinosaurs will never know about.

Tattoos too. The areas where we find human remains with cool tattoos don’t coincide with cultures that tattooed themselves, they coincide with places where preservation of tattooed flesh is the most likely. There’s a good chance that humans everywhere had rad tattoos and cultures associated with them that we’ll never know about.