The vision of the dry bones in the book of Ezekiel is a depiction of hope. In this vision, the prophet Ezekiel sees a valley filled with dry bones, which symbolize the Israelites who were in exile and felt hopeless and defeated. However, God shows Ezekiel that he has the power to bring these dry bones back to life and restore them to their former state. This vision represents God's promise to restore hope and bring new life to his people, even in the bleakest of circumstances.