In Stephen King's novel "Misery," the quote "When you own a piano, it's harder to think about moving" reflects the emotional and practical challenges of attachment to possessions. The piano symbolizes a significant commitment that can weigh heavily on one's decisions, making the idea of relocating more complicated. This metaphor highlights how certain belongings can create a sense of obligation and inhibit freedom.

Furthermore, this statement underscores the idea that our attachments to objects can influence our life choices. The heavier the emotional investment in a thing, the more difficult it becomes to leave it behind. This sentiment resonates with the broader themes in "Misery," where characters grapple with their own desires and the constraints imposed by their circumstances.