I have found with 1blue3brown that I sometimes have to wait a while and ponder things and go back and watch the video again some time later. So this particular

I have found with 1blue3brown that I sometimes have to wait a while and ponder things and go back and watch the video again some time later. So this particular video was working for me up to a point and then I maybe just missed some important point that hopefully I'll catch on a re-watch next week or so.