Gitlin provides are broad history of media over the past few centuries.  The portion addressing books is fairly limited, but he does offer some interesting pieces of information.  For example, he looks at the trend that book sales have grown per capita since 1936, and that the readership base of best-sellers is actually less educated that it was in 1936 (101).  Gitlin is useful in obtaining a broad understanding of the media and its changing nature, particularly over the past seventy-five years. 

Walker and Chaplin walk through the theory and history of Visual Studies. They begin with an exploration of the notion of culture, particularly as a foil to nature. The notion of culture, they argue, is inextricably linked to what the economy allows and, perhaps more importantly, deems necessary, allowing the members of a society to establish a hierarchical pattern. Now, however, "culture" is increasingly used to describe any aspect of daily life. Next, the concept of the "visual" is explored, both in how it is sensorally experienced, and what the repercussions of this perception are.

Chapter four's discussion of theory and its various manifestations is particularly interesting, as it explores not only self-conscious theory (e.g., philosophers and people who fancy themselves theorists) but also theory-as-byproduct; that is, theory that developed more organically. "In sum, there are not only theories of art, but also theories for art; theory-informed art, and even theories as art" (62). This is an especially helpful screen for considering why book covers are designed as they are.

The chapter entitled "Production, Distribution and Consumption" has a helpful explanation and description of consumer models, and examines the theories behind the design and distribution of products. In the following chapter, they examine the roles of institutions in creating various products designed to perpetuate their ideals. They explain: "in the case of large, complexly structured arts and media institutions employing or commissioning teams of specialists to produce films, televesion programmes, etc., the influence of the institutions on the content, form and ideological agenda of the final product is likely to be harder to judge because of the many functionarires and levels of mediation involved" (94).

The notion of looking and voyeurism is also explored. This is a critical concept when considering the "why" of book covers; people's selections of books mirrors their interests, and the visual to which they are drawn is an immediate indicator. Therefore, one can extrapolate from the text, that selecting a book by its cover is a sort of narcisistic voyeurism.