First published in 1781, the 'Critique of Pure Reason' is a work in which Kant attempts to understand the relationship between human knowledge and experience. In this book, Kant proposes a 'Copernican revolution' in philosophy, arguing that it is the structure of our mind that determines the nature of our experience, not vice versa. The work addresses complex issues such as the possibility of metaphysics, the limitations of human knowledge, and the distinction between sensory perceptions and understanding. It is known for its depth and complexity.