 In Whitehead’s London writings, there is no “atomic structure” of events (1920 [1986: 59]). The events constituting the passage of nature, and underlying the abstraction of a continuous space-time, were continuous events. In his first academic year at Harvard, however, Whitehead changed his mind. Henceforth he conceived of the passage of nature as atomic, as constituted by atomic events. In The Emergence of Whitehead’s Metaphysics: 1925–1929, Lewis Ford had already given an account of the change in Whitehead’s thought from continuous to atomic becoming in the spring of 1925 (1984: 51–65). In “From Physics to Philosophy, and from Continuity to Atomicity” (Henning &amp; Petek 2020: 132–153), Ronny Desmet confirmed Ford’s account by means of a close reading of The Harvard Lectures of Alfred North Whitehead 1924–1925. Moreover, Desmet made clear that the main reason for Whitehead’s change of mind was not the rise of quantum mechanics, nor the fact that the atomicity of becoming provided a solution to Zeno’s paradox of becoming, nor even that it was needed to include contingency and freedom in his philosophy. The main raison was that this atomicity prevented his philosophy to contradict our immediate experience of the irreversibility of time. But no matter its reason, the introduction of the atomicity of becoming in Whitehead’s philosophy implied the granularity and indeterminism of reality that are needed, next to its relationality, to develop a feasible interpretation of quantum mechanics within the frame of this philosophy.