The quote "Open for sun, closed for rain, that's the poor man's weathervane" from Susan Cooper's book "Silver on the Tree" reflects the simple yet profound connection between the natural world and everyday life. It suggests that the poor man's reliance on basic, observable signs of weather shows a deep understanding of his environment. This highlights how those with fewer resources often have to be more attuned to the signs around them to survive and thrive.

Moreover, the phrase embodies a sense of resilience and adaptability in the face of challenging circumstances. The imagery of a weathervane, a device that indicates the wind's direction, symbolizes the need for vigilance and responsiveness to changing conditions. In essence, the quote encapsulates the wisdom found in simplicity and the ability to navigate life's uncertainties through keen observation and practical awareness.