Thanks for this Brendan. I am somewhat familiar with Gebser and I see resonance with my work and his. And yes, definitely much overlap with Schumacher, although I found his Guide for the Perplexed only in about 2010. I was really struck by how similar it was. Of course, it also is the case that the "rocks, plants, animals, human" taxonomy is arguably the most basic, generalizable taxonomy ever. Feel free to shoot me an email if you want to discuss this more.