In Haruki Murakami's book "What I Talk About When I Talk About Running," he compares the thoughts that arise during his runs to clouds in the sky. These thoughts vary in size and shape, appearing and disappearing, but the sky itself remains constant and unchanging. This metaphor illustrates the transient nature of thoughts, suggesting that they are temporary disturbances in a more stable and enduring reality.

Murakami emphasizes that while thoughts and distractions may come and go like clouds, the core essence of the self, represented by the sky, remains intact. This perspective encourages a sense of detachment from fleeting thoughts, allowing for a deeper understanding of one's mind and resilience amidst life's uncertainties.