> The heart is not a pump!

Same. I went to Montessori in first grade. 1989.

Waldorf schooling, the other one people usually mention in connection with Montessori, was created by Steiner. So were biodynamic farming and a few other things. A lot of biodynamic farmers and Waldorf educators/educated people have no idea about the Anthroposophy connection. And more than a few "Waldorf" schools are so diluted that they are hardly even Waldorf anymore. But it's an interesting tradition. All of it stems from Steiner's focus on awakening all the soul's faculties in an integrative, holistic, organic way, i.e., so that none of the parts are hypertrophied or atrophied.

Explain how as a primitive man you would learn about internal organs. If you lived in any culture with normal burial customs and no constant battles you would likely never see the inside of a human. You would only see the insides of other animals which would not appear as mountains or whatever.

Well Steiner's point is more that everything that exists, including our body, is a microcosm of the macrocosm and vice versa, i.e., there are cosmic hierarchies in nature that reflect the ultimate unity underlying them (and ultimately uniting them of course, since they all participate in and emanate from the One). So nothing in nature is "accidental" except at the absolute surface of things. Steiner has a mixed worldview that tries to sublate both modern evolutionary and developmental thinking and older teleological "rationalistic" thinking that sees the world as a static "great chain of being," basically a dialectical synthesis of the two tendencies described by Lovejoy in The Great Chain of Being, which is a fantastic book by the way.

So if your body is a telic microcosm of the divine plan in the same way that the "paradigm" obeyed by the Demiurge in the Timaeus or the Ideas beheld by Nous in Plotinus emanate somehow from the ultimate principle of existence, and everything in existence is modelled on them and derives from them, including your own consciousness (nous) is also a telic microcosm of the cosmos, it's not a large jump to think that an intuitive/spiritual understanding of your own body might not be more like "inhabiting a temple" or "exploring an orderly cosmos unto itself" than just external knowledge of this dead material thing. Also, for Steiner the ancients weren't primitives, there were ages and ages of different levels of esoteric and partly disembodied existence etc. Especially in past ages, in Steiner's view, people had more direct, intuitive, "easy" access to many esoteric truths but often less conscious knowledge of them. It's one of the unique aspects of present humanity and the modern epoch that we are on the threshold of combining perfected abstract scientific knowledge with intuitive sensing, feeling, and willing.

Steiner also says that the way that we see matter and physical structure etc. is only seeing the external dead "husks" of things. Check out the book Man or Matter by Ernst Lehrs.

Explain how as a primitive man you would learn about internal organs. If you lived in any culture with normal burial customs and no constant battles you would likely never see the inside of a human. You would only see the insides of other animals which would not appear as mountains or whatever.