Yeah and knots from the literal knots in that rope attached to that literal log. Not sure what you expected though, look at the etymology of any word and you ge

Yeah and knots from the literal knots in that rope attached to that literal log. Not sure what you expected though, look at the etymology of any word and you get back to something concrete and tangible eventually (with rare exceptions for a few feelings and such.) We haven't been abstract that long, so most of it is metaphor or analogy.