I was thinking something similar. The first few levels of "abstraction" seem to me to be more about visualization skills and spatial reasoning. For example, w

I was thinking something similar. The first few levels of "abstraction" seem to me to be more about visualization skills and spatial reasoning. For example, we'd expect a painter to be particularly good at those, but not necessarily good at math or monads. The 4th level seems like a totally different kind of category from the first three. Which, come to think of it, matches my personal experience. I have zero spatial ability---back in the 80's in California they actually gave us standardized tests in elementary school including a spatial ability section, and my scores were always like 90+%-ile math, verbal, and like 20%-ile spatial. Never been able to draw for shit. But was always advanced in math, 99th percentile lsat (logic-heavy) scores, top grades in stats, etc. So am I at the 4th level but not at all at the first three?