We are three dimensional beings. Just in case you weren’t sure. Everything we do, everything we understand, is in the squishy three dimensional world we understand in. The fourth dimension for current thinkers is a wibbly-wobbly concept of space-time. Human brains, unfortunately, are currently not equipped to experience the world in space-time.
We are three dimensional beings that use negative numbers. Cavemen did not have a need for negative numbers, and the fact that our brains can conceptualize it is quite remarkable. Natural numbers (positive whole numbers) were probably difficult enough for our ancestors to understand. But the idea of less than nothing? What a remarkable concept! I’m certain that our primate cousins could not only not understand negative numbers, but they probably could not understand why they would be needed at all. But being three dimensional beings, with enough brain power, a long lifespan, and the ability to build on previous knowledge, it seems inevitable when considered.
