Roy Sorensen here defends the causal theory of perception by treating absences as causes. He draws heavily on common sense and psychology to vindicate the assumption that we directly perceive absences. Sorensen's book provokes thoughts about the nature and significance of seeing. His Eclipse Riddle is intriguing, as are the general questions he raises about seeing dark things. There are no easy answers to these questions. I enjoyed reading Sorensen's book, and thinking about the issues it raises. Others will too.