Freiburg's pavements are decorated with icons made of cobblestones in
contrasting colors. In
Cities Observed, Suzanne H. Crowhurst Lennard and Henry L. Lennard
describe what happened when the Altstadt was pedestrianized several decades ago:
"The city paid very special attention to the repaving of
the streets and squares. Kerbs and asphalt were removed from all streets,
and natural stone paving--reddish quartzite, black basalt, granite and red
porphyry and pebbles from the river Rhein--were used almost without
exception in the medieval city center.
"Indeed, the floor of the city has been treated as the
city's 'carpet.' It is a work of art, and exhibits fine craftmanship.
Geometric and flower designs, historic, cultural, and business symbols,
executed by traditional artisans working with the different coloured stones,
pebbles and mosaics emphasize the unique character of each street, stimulate
a sense of history, and prompt fantasy and imagination."