The imagination is a mysterious thing. We criticize some people for having too much of it, and others for not having enough. Without imagination, there would be no art, no science, and perhaps no meaningful thought at all. But it is notoriously hard to define, extremely variable between individuals, and entangled with so many similar cognitive processes that it often seems impossible to say anything specific about it at all. 1 Given these theoretical difficulties and a historical aversion in philosophy of science to anything psychological, it is not surprising that the role of imagination in science has gone mostly unremarked until recently. 2 Nevertheless, thanks to new work in philosophy of science, philosophy of mind, psychology and epistemology (not to mention the cognitive and social science of science and science education studies), we are now in a position to investigate the supermassive black hole at the center of scientific practice. What is scientific imagination? How, if at all, does it differ from non-scientific imagination? When is it deployed, and for what purposes? What justifies its use? What are its epistemic outputs? How is it taught, evaluated, and understood by scientists? Can it be improved or calibrated? How is it enhanced by collaboration and computers? How can imaginative biases be overcome? Who gets to do the imagining in science? These are questions we are now beginning to answer.The Scientific Imagination, edited by Arnon Levy and Peter Godfrey-Smith, seeks "to provide a comprehensive and exciting picture of the scientific imagination" (book jacket), and "to showcase current thinking ["the role and character of imagining within science"] and try to organize it into a coherent research agenda" (p. 1). There are thirteen chapters and an introduction. Ten are written by philosophers, and three by cognitive scientists. Of