Tianguis, or outdoor markets, in Mexico City, appear in “different neighbourhoods on different days of the week, and filled with vendors selling everything from fresh vegetables to pirated Montblanc watches.” This account notes that “plastic awnings, blue, yellow, or most often, red, enclose the rows of stalls as thoroughly as concrete encloses a shopping mall.” Evidently, this occurs at a scale that it is actually visible on Google maps: Recurring Rivers of Red