These videos are referring to comments and questions found here:
youtube.com/watch?v=y3v7pfNG5JQ
youtube.com/watch?v=qK5aQdNke4s

Zennist’s articles are here:
zennist.typepad.com/zenfiles/2016/09/observing-the-observer.html
zennist.typepad.com/zenfiles/2016/09/scraping-off-the-dried-mud.html