Example3

"Paris was a museum displaying exactly itself."

_Jeffrey Eugenides

Paris is the city with the streets that don't sleep. They are alive all day, living and breathing with the people who live there. The streets of Paris are the result of the rapid growth it had 1850 and Haussmann's plan of several symmetrical roads connected with smaller diagonical ones. 

What makes a city walkable?
Walkability focuses on neighborhood or village scale development, with many nearby places to go and things to do. Truly walkable communities are characterized by much more than good sidewalks and street crossings, they include many attributes: a mix of uses, frequent street connections and pedestrian links, timeless ways of designing and placing buildings. They create desirable places to spend time in, to meet others. All core principles for successful towns and cities evolved naturally from earliest times.

• A center: Walkable neighborhoods have a center, whether it's a main street or a public space.
• People: Enough people for businesses to flourish and for public transit to run frequently.
• Mixed income, mixed use: Affordable housing located near businesses.
• Parks and public space: Plenty of public places to gather and play.
• Pedestrian design: Buildings are close to the street, parking lots are relegated to the back.
• Schools and workplaces: Close enough that most residents can walk from their homes.
• Complete streets: Streets designed for bicyclists, pedestrians, and transit.

Paris was created from a series o villages coming together, an identity it preserved through the years as you can see the various neighborhoods existing today. A neighborhood, like a village, has the ability to serve to the needs of the citizens within its range without needing them to cross vast distances.
   
This fact, is  further accentuated if one looks into the spread of uses throughout the city. They are not focused into zones but they are within walking distances of every household.