Figure 13b. “Grasslands spread so hoofed animals transformed,” display, 2007. Photograph by the author, from The Evolving Planet exhibit at the Field Museum in Chicago. Linear arrangements of displays such as this one often seem unavoidable. However, designers must be aware of the interpretations viewers may make. Do viewers see the specimens as examples of a diversity of adaptations to a single environment? Or do they see a progression from primitive to more sophisticated animals?