How many senses do we actually have? What does 'white' smell like? And why do humans like to be covered when they sleep? In this revelatory book pioneering Oxford professor Charles Spence shows how our senses change how we think and feel, and how by 'hacking' them we can reduce stress, become more productive and be happier. From sensory overload and what happens when you lose a sense, to how technology will change the way we perceive the world around us in the future, Spence shows using cutting-edge science how the senses interact and affect one another—and what is happening inside our heads—revealing how to enhance our lives in his signature entertaining way.