As the title of the New Elucidation of the Principles of Metaphysical Cognition indicates, it is a new attempt to clarify the cognitive principles needed for understanding the structure of reality. The force-space bond in Kant’s first book, as well as the attractive-repulsive interplay in his second, reveal that dynamic interactivity is the generative matrix of nature. Interaction is not “one” thing but involves at least two poles that engage with one another. Because the dynamic “between”—their link—is fundamental, the cognitive tool for capturing the ultimate reality cannot be “one” principle. It cannot even be a basic principle of identity (a = a). Interaction is a relation of distinct items that grip one another—if they were not distinct, the event would be an action, not interaction. But it is dynamic interactivity that is the thing in itself.