In Haruki Murakami's novel "1Q84," the quote "If you never noticed, it never happened" emphasizes the significance of perception and awareness. It suggests that our experiences and realities are largely shaped by what we choose to recognize. If events go unnoticed, they become meaningless and can fade from our personal history.

This idea reflects a central theme of the book, where characters navigate parallel worlds and realities. Their journeys show how one's attention to details can alter the course of their lives, illustrating the power of observation in shaping existence and the subjective nature of reality.