@mcc Btw., I just rewatched the SpaceTime video (first saw it years ago) and found it quite well made — which was definitely in part due to having seen it and similar lectures about the topic before. So I've already developed a certain tolerance to this weirdness, but still I still had to occasionally pause the video at a few points to mentally catch up. That's how I discovered that other video: YT suggested it as related and I watched it in those breaks.