It got downvoted, but I find the duality of sameness vs difference one of the most fascinating.

I'm (trying to) view the video, player cooperation willing....

A bit longish, though if this is a single take, I'm impressed by the presentation (I've yet to see a cut in the first 15 minutes or so).

"Similarity" and "difference" are relations, and as the speaker notes, relative to viewpoint. I've done some earlier research and thinking into the meaning and distinction of value, where utility-value (related to economic value) is based on relations as well -- to the producer or creator of an item or service, as well as the user or owner's use value. And these are not generally intrinsic.

Aristotle's Categories are a good starting point for considering relations, even now.