the notion of commonality exists in the head of the observer because it's a useful fiction. (even 'the horse' itself is). But that is a subjective form of exist

the notion of commonality exists in the head of the observer because it's a useful fiction. (even 'the horse' itself is). But that is a subjective form of existence, what Jakob von Uexküll called one's "Umwelt" (the world as it presents itself to you). There's no reason to believe it precedes matter, or that triangles exist in a world without anyone to conceive of them. edit: there's a great talk by Daniel Dennett on the topic that luckily still is up on archive.org https://web.archive.org/web/20161125135644/https://www.youtube.com/watch?v=GcVKxeKFCHE https://web.archive.org/web/20161125135644/https://www.youtu...