‘Most things in the world are absolute in terms of taking someone’s word for it. For example, rulers. But if you yourself made a sphere, you could never know if it was one. That fascinates me. Nobody will know it. It cannot be proven, so long as you avoid instruments. If I made a sphere …
https://ricdragon.com/2017/05/16/most-things-in-the-world-are-absolute-in-terms-of/