Whether a marketing campaign or a museum exhibit, a video game or a complex control system, the design we see is the culmination of many concepts and practices brought together from a variety of disciplines. Because no one can be an expert on everything, designers have always had to scramble to find the information and know-how required to make a design work - until now. This comprehensive, cross-disciplinary encyclopaedia of design pairs clear explanations of every design concept with visual examples of the concepts applied in practice. From the "80/20" rule to chunking, from baby-face bias to Occam's razor and from self-similarity to storytelling, every major design concept is defined and illustrated for readers to expand their knowledge.