Division of Labor, Geometry, Architecture

One of the earliest recorded examples of a separation of what Marx-Engels call, in the German Ideology, "mental" from "material", is Pythagoras' conversion of applied Geometry, e. g. land measurement, to pure Geometry.  But Pythagoras does not maintain that duality.  Rather, he further proposes that 'matter' is nothing but 'mental' entities, i. e. combinations of pure Geometrical figures, a thesis that continues to have influence, from Plato, to Leibniz, and lately among Fractal Geometers.  Now, one prominent recent Pythagorean is Buckminster Fuller, who not only conceives 'matter' to be constituted by triangles, but extends that vision into his own artifacts, i. e. geodesic domes, structures that are actualized by builders. So, Marx-Engels' claim that Division of Labor begins with the separation of mental labor from material labor is far-fetched in several respects.  First, it is sheerly speculative, whereas according to a better-evidenced account, pure mental activity is first separated from applied mental activity, not from merely material activity.  Second, it is not the case that perhaps the most influential Mental ontology in history is part of a Dualism--it is Monistic. And, third, the Architect-Builder division of labor, in which the former is inspired by a purely Mental ontology, is one that is complementary, not antagonistic.  In other words, its history of Division of Labor is another less than compelling theoretical feature of Marxism.