By offering an original elucidation of the notion of the imagination in the writings ofImmanuel Kant, Johann Fichte and Cornelius Castoriadis, this book addresses and brings to the fore the significance of the imagination as the ontological source of human creation.Principally inspired by Castoriadis's revolutionary elucidation of the imagination and the imaginary, this book actively contributes to this neglected line of enquiry by exposing deep lines of continuity and rupture both within and between the revolutionary writings of Kant, Fichte, and Castoriadis. Beginning with Kant's hesitation in describing the productive imagination as a creative power, this book traces these lines of continuity and rupture through an elucidation of the form and content of Fichte's philosophical system, known as the Wissenschaftslehre, and through an elucidation of Castoriadis's remarkable concept of the radical imaginary.Engaging with these lines of continuity and rupture allows this book to contribute to the landscape of thinking by offering a new elucidation of the imagination in the formof the "embodied imagination."