Alley may be paved, or unpaved, and a blind alley is a cul-de-sac. Modern urban developments may also provide a service road to allow for waste collection, or rear access for fire engines and parking. Because of geography, steps (stairs) are the predominant form of alley in hilly cities and towns. This includes Quebec City in Canada and in the United States Pittsburgh (see Steps of Pittsburgh), Cincinnati (see Steps of Cincinnati), Minneapolis, Seattle, and San Francisco as well as Hong Kong, Genoa and Rome. Some alleys are roofed because they are within buildings, such as the traboules of Lyon, or
The Blind Leading the Blind who had suffered punishment for wrongdoing or fighting. Bruegel painted with the empirical objectivity of the Renaissance. In earlier paintings the blind were typically depicted with eyes closed. Here, Bruegel gives each man a different ocular affliction, all painted with a realism that allowed identification of their conditions by later experts, though there is still some diagnostic disagreement. French anatomical pathologist Jean-Martin Charcot and anatomical artist Paul Richer published an early account, "" (""The deformed and sick in art"", 1889), and French pathologist Tony-Michel Torrillhon followed with more research on Bruegel's figures in 1957. The first man's eyes are not