For color to exist there needs to be light, an eye, and a brain to process the data. We know that more than half a billion years ago there were no image-forming eyes, only basic light receptors that allowed organisms to tell the difference between light and dark. Spanning millions of years, this evolutionary history of color and vision shows how superior eyesight became one of the most important adaptations among emerging species. Drawing on specimens from the collections of London's Museum of Natural History, this book looks at the evolution of the eye, the uses of color in nature, from a warning or disguise to an irresistible invitation, and explains how color works.