The introduction begins by acknowledging that the reasonable person is not just a powerful legal concept but also a legendary legal figure that is little understood. It explains briefly how the concept operates in practice and introduces the book’s core argument concerning empathetic perspective taking. Outlining the structure of the book, the introduction then proceeds to addressing the limitations of the analysis and the unique challenge of setting out to write a biography of the reasonable person without either caricaturising or fetishising it.

Chapter 3 focuses on the application of the reasonable person in the nineteenth and twentieth centuries. The chapter begins by considering why the reasonable person is frequently placed on means of public transport. It argues that the reasonable person’s presence on the omnibus means that others can see it and that the reasonable person itself sees others. The chapter then considers whether the standard of the reasonable person was meant to be an empirical standard or a standard controlled by the courts. It does so by asking whether the idea was that one could actually encounter the reasonable person on the Clapham omnibus. Contrasting the concept of the reasonable person with the concept of the average human person proposed by the Belgian sociologist and astronomer Adolphe Quetelet, the chapter establishes that the reasonable person was meant to be a court-controlled standard. Finally, the chapter shows how the standard has historically been construed exclusively in male terms. It addresses the discriminatory potential of the standard and acknowledges that the reasonable person concept has often been applied in a manner that excludes anyone who does not share the characteristics of the male, white, middle-aged judge who applies the standard.