Two extreme interpretations of atomism have persisted through centuries: the näive assumption of objectively real indivisible pieces of matter, and the sophisticated view that "atom" is merely a name given to abstractions which it is convenient to assume in simplifying complex phenomena. The second perhaps stems from Ockham, who wrote in 1330 of "the fiction of abstract nouns"; from John Troland, who in 1704 interpreted material particles as mental fictions; and from countless others down to Ernst Mach, who after starting as a physical atomist came to regard atoms as "mental artifices" or "economical ways of symbolizing experience."
Both views have advantages...

Discontinuity of its linguistic and logical terms is for the conscious analytical intellect psychologically and logically prior to notions of continuity. ...This functional priority... may not have been reflected in the history of the development of reason in all human communities. ...But it is relevant for the West that the Pythagoreans, with their discrete integers and point patterns, came before Euclid, with his continuous metrical geometry, and that physical atomism as a speculative philosophy preceded by some two thousand years the conception of a continuous physical medium with properties of its own.

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There is no doubt of the need for an up-to-date, balanced, and comprehensive work on the history of atomism, drawing ideas, mathematics, and experiment together into a single story. When available, it should become required reading for all students of the exact sciences.

Systematic errors of theory can seldom be discovered by direct attack; it is easier to uncover them by studying how and why physical theory took the path it did. That is why a clue to the future can sometimes be found in the past, and this is my reason for studying the history of atomism.

The most productive novelties often spring, in thought as in biological evolution, from more primitive and simpler forms, rather than from differentiated ones which, through their elaboration, have become too specialized to be adaptable to new tasks.

Physics and psychology are going somewhere, but where they do not know. But... they are traveling from: Democritan permanent particles and the Cartesian mind necessarily aware. ...they are both traveling away from the same point of origin and in the same general direction: from the isolation of supposedly permanent "substances" towards the identification of changing relations potentially affecting everything; briefly, from substance to changing relations and structures.

No scientist has yet provided an acceptable definition of "mind" or "mental" that reveals the character of "unconscious mental processes," and no physicist a lucid definition of "elementary particles" that shows how they can appear or disappear, and why there are so many.