"How Different is Different?" by Daniela Büchler is a specialized book that addresses the challenges of product differentiation in design. It highlights how incremental stylistic changes to physical forms can influence the perception of products. The author examines the relationship between real and perceived differences and explains that the visual perception of a designed object depends on both its physical properties and the cultural backgrounds of the viewers. The book discusses the theoretical discrepancies between the psychology of perception and the approaches of material culture research, proposing a more comprehensive model that details and expands on the perception of designed objects. It is a valuable resource for professionals and students in the fields of design, architecture, and material culture.