In "Bird by Bird: Some Instructions on Writing and Life," Anne Lamott describes a subtle yet significant noise, likening it to the varied sounds found in a creek. This metaphor illustrates the complexity of thoughts and ideas that can arise in our minds, suggesting that inspiration can manifest in many forms, often unexpectedly.

Lamott also emphasizes that this "subterranean murmur" can present itself in a cryptic manner, sneaking up on us when we least anticipate it. This highlights the unpredictable nature of creativity and the importance of being open to those fleeting thoughts that may emerge from our subconscious, encouraging writers to pay attention to these whispers of inspiration.