Every few years I pull Freeman Patterson's Photography and the Art of Seeing off the shelf for a re-read. It's a strong book on the fundamentals of composition and visual design, including tone, light, shape, perspective, colour, dominance, balance, proportion, pattern, rhythm...the list goes on), and exercises aimed at developing a keener awareness of the subject and moving beyond first inclinations. It's a first step toward 'contemplative' photography (hello 'relaxed attentiveness'). I seem to give away this book each time I buy it (including the copy I just read). Highly recommended for those interested in understanding what makes a picture 'work' and ways of capturing images that reflect how we feel.