In this book, we pose the question, “Is imagination important to human-computer interaction (HCI)?”. While denying such a role is not plausible, the evidence suggests otherwise. There is no substantive treatment of imagination anywhere to be found in the HCI literature. There is no reference to imagination in accounts and models of interaction, or any mention of imagination in any of the popular HCI undergraduate textbooks, and there is little or no mention of it (except obliquely) in the numerous design guidelines distilled from good practice. Yet as HCI professionals, practitioners, researchers, teachers...