because there are these "weird" spatial geometries on the elementary distance level (PS. sorry, this is unlear) PS. I mean physically 1 meter + 1 meter != 2 meters, because there is not that kind of precision on any of of these numbers regardless, as long as it is grounded in our universe PS. like even if you have 2 theoretical units of distance, one you ground them into the real world they can not be infinitely precise, and neither can their answer PS. It seems to me that the real universe can not be infinitely precise, and distance seems like a theoretical/mathematical abstraction having to do with Newtonian times. Let me rephrase the question: How does 1+1=2 connect with elementary distance measurements?