The 'Critique of Pure Reason' is a foundational philosophical work by Immanuel Kant, published in 1781, which seeks to understand the relationship between human experience and knowledge. In this book, Kant argues that while our understanding is shaped by our experiences, there are innate structures in our mind that shape how we perceive and comprehend the world. This dual approach laid the groundwork for modern philosophy and emphasized the importance of reason, making it a pivotal piece in Enlightenment literature.