‘Immensely learned and ambitious…seam-bursting eclecticism and polymathic brio… This is by any standards a significant book and its author deserves high praise.’ Literary Review To imagine – to see that which is not there – is the startling ability that has fuelled human development and innovation through the centuries. As a species we stand alone in our remarkable capacity to refashion the world after the pictures in our minds.Traversing the realms of science, politics, religion, culture, philosophy and history, Felipe Fernández-Armesto reveals the thrilling and disquieting tales of our imaginative leaps. Through groundbreaking insights in cognitive science, he explores how and why we have ideas in the first place, providing a tantalising glimpse into who we are and what we might yet accomplish. Fernández-Armesto shows that bad ideas are often more influential than good ones; that the oldest recoverable thoughts include some of the best; that ideas of Western origin often issued from exchanges with the wider world; and that the pace of innovative thinking is under threat.