Dierter

Whether we think Dieter was Kier's real twin or part of him... I think there is a different layer of Chapter 1 of Appendix IV in addition to the obvious allegory to masturbation and shame.

This is an observation/analysis and not necessarily a theory.

To me, after seeing the texts actually spelled out (instead of listening to them - there is always something weird going on with my brain when I listen to audio books)...

I think there's something going on about Kier's relationship with nature vs. nurture. It's ironic that this episode happened at the "DieterEagan National Forest" (which I personally believe is fake; they are still inside Lumon, but I digress) whereas Lumon is this big man-made structure within a town named after Kier himself.

The passage we heard alluded to how "Dieter" was drawn to nature (to be paupers in the woods!!), and gave in to his natural instincts, desires and feelings. And the way Kier described him (turning into moss, etc.) signified that Dieter was one with nature.

Meanwhile, Kier was all about making things and control - the taming of the four tampers (nature) is a big clue. Whatever Lumon is -- you can see everything is well controlled, structured, from the decor of the severed floor to the cold, ordered board room, goat room, to what they are doing (handbooks, instructions, protocols, data refinement whatever it is, etc.) -- it is a man-made, controlled enterprise. They control the innies. Jame controls Helana. My own theory that the ORTBO is a controlled environment within Lumon aligns with this analysis.

By taming his tampers (nature), Kier became a believer that nurture was the key. His entire enterprise, cult and doctrine were based on the idea of nurture over nature.

Nature, to him, is Chaos's whore.

And that leads us to the story of Cain and Abel. There are plenty of parallels between the two stories. Both were brothers, one represents nature, and the other man's creation and control. At the end, Cain killed Abel because he was jealous that Abel was closer to God. At the end, Dieter died and Kier lived and tamed his tempers (nature).