This concise and engaging essay presents an accessible portrait of Immanuel Kant, crafted by cognitive scientist Massimo Piattelli Palmarini as a "private lesson" for his adolescent son. Written in 1994, it distills Kant’s life, philosophical ideas, and intellectual legacy into clear, relatable prose—inviting even novice readers into the heart of his thought. The book remains refreshingly informal and vivid, blending philosophical rigor with the warmth of personal address, and serves as a model of effective philosophy dissemination.