A typical work, such as Seven Days, consists of a single beautiful black-and-white photograph taken on an epic walk, with the mileage and number of days taken listed beneath.

While incomes have increased among both black and white families in the past three decades -mainly because more women are in the work force -the gain is greater among whites.

An analogy that applies to levels of abstraction is that of a black-box view (a higher level that does not show implementation details) and a white-box view (an inside look at how things work).