In this paper, I propose the “generative soil” model to conceptualize the unconscious processes essential to creative imagination. This model depicts the human mind as having three layers—“above ground,” “ground surface,” and “underground.” The essence of creativity is said to reside in this metaphorical soil. Conscious activities take place above ground, memories accumulate at the surface, and unconscious processes unfold underground. Surface memories retain their form and remain accessible. In contrast, mental content that sinks underground transforms into nutrients—losing its original form but enriching the soil that nourishes imagination. Individual differences in experience lead to distinct nutrient compositions in each person’s generative soil, shaping their unique individuality. This paper also presents the “generative matrix” model for generative AI, which, while analogous to the human generative soil, differs in critical ways. Generative AI primarily assimilates linguistic data, rather than direct experiences, and cannot generate authentic feelings. Consequently, generative AI lacks the individuality that emerges from personal history. However, it possesses a distinctive strength: its knowledge base is collective and general, incorporating diverse perspectives. This fundamental difference makes generative AI a valuable partner in creative collaboration, offering complementary capabilities that enhance human creativity.