Richard Brautigan's quote reflects on the passage of time and the inevitable changes that come with it. The imagery of aging "in darkness like wood" evokes a sense of decay and stagnation, suggesting that, like wood, we experience a slow transformation that is often unnoticed until significant changes occur. The metaphor highlights how our lives are intertwined with the surrounding environment and the subtle shifts in our identities.

Furthermore, the mention of "watching our phantoms change their clothes" implies a sense of loss and nostalgia. As we age, the memories and versions of ourselves can feel ephemeral, akin to ghosts shifting forms. This conveys a poignant reminder that while we may change and evolve, there’s a lingering connection to our past selves, represented by the "shingles and board." The quote encapsulates the melancholic beauty of life's transitory nature.