[hammock]

Innate, instinctive, intuitive, natural, automatic. I don’t think obvious is a bad word though.

Descartes did not invent x-y coordinates until the 1600s, yet a table of columns and rows is totally natural and emergent given a two-dimensional recordkeeping medium

[HappMacDonald]

I'm never not going to be gobsmacked that Euclid didn't ever try using a coordinate grid as a tool. 8I