I think the counting is natural to human. The corresponding theory op used is not natural. If one has to use that, one start to use writing to do corresponden

I think the counting is natural to human. The corresponding theory op used is not natural. If one has to use that, one start to use writing to do correspondence. Or use shell/good/coin. That is for +integer. Not sure about how natural is real number other than pi using geometry. And irrational also use geometry. Use algebra and group-ring-field is very late.