Within the depth-psychology and philosophical corpus assembled under the Seba library, ‘Becoming’ operates as one of the most contested and generative ontological categories, traversing metaphysics, process theology, individuation theory, and contemplative philosophy. Sri Aurobindo frames the tension most sharply: Being is the fundamental reality while Becoming is its ‘effectual reality,’ a creative energy that cannot be dismissed as mere illusion without forfeiting half the truth of existence. Against monisms that exile change from essence—Simondon’s critique targets Leibniz and Spinoza equally—Simondon argues that Becoming is not opposed to Being but is rather ‘the constitutive relation of being qua individual,’ the very engine of ontogenesis. McGilchrist, drawing on Whitehead, Schelling, and Meister Eckhart, elevates Becoming to a theological register, proposing that ‘God is Becoming’ situates the divine not in sequential time but in an eternal Now of perpetual creation. Plato’s Timaeus supplies the classical problematic: how can Becoming occur at all given that its parents—Form and Space—are both eternal and unchanging? Across these positions runs a recurring tension between the primacy of process over substance, the inadequacy of hylomorphic and atomistic doctrines to account for genuine transformation, and the question of whether an eternal ground underlies, encompasses, or simply is the flux of temporal existence.