Tag Archives: emergent design

The Cultivation of a Spontaneous City

This is the last of a series of excerpts from my article in the upcoming issue of the International Journal of Architectural Research, about the principles of emergent urbanism. Click here for part I, The Journey to Emergence. Click here for part II, The Fundamentals of Urban Complexity.

How emergent urbanism works

In a traditional spontaneous city, 100% of the surface is initially a network structure, open land. From this surface the best paths are selected to fit the networks that are emerging, and the leftover space is progressively built upon. Starting with a completely open, fully-connected land structure, the city’s design can consist of a purely negative process by placing constraints on construction over important paths. In this way the street structure and hierarchy becomes an evolved structure that matches the history of its networks, and the placement of buildings and uses is also an evolved structure that matches the flows of movement. Over time these paths are paved and upgraded, and important junctions of paths become the central open space of the city. The central square of a spontaneous town can be explained as the remainder of a fractal process of subtraction, with the most underused part of the spatial network being removed at each additional step of feedback until no further network subtractions are possible. With the circulation of people optimized, the remaining space is augmented with street furniture specifically designed for crowds, such as benches, transit stops, billboards, kiosks and so on.

An emergent city similarly begins with a network structure, although one that is much more sophisticated than open land. In modern design the typical asphalt street produces a network that is suited particularly to automobile networks, but also has the unfortunate side-effect of cutting pedestrian networks that normally enjoy the entire surface in a spontaneous city. As a remedy these streets are equipped with sidewalks that are often narrow and unpleasant (if not dangerous) to walk, an effort at translating strict traffic control methods to the pedestrian. It is not surprising that pedestrians are so rare in modern cities, but some efforts have shown that pedestrian networks can emerge from modern design. One example is the three-story deck of the La Défense business city in Paris (shown in figure 7), which contains parking but also regional rail and subway links, as well as being an open pedestrian surface. At the ends of this network structure a generative process of spontaneous development creates the actual networks of the city. As evidenced by the crowds present on that surface and the abundance of neighborhood shops the pedestrian networks function quite well. What is more surprising is that the automobile networks are underused and some parking structures empty, despite the neighborhood having been conceived for the automobile.

Figure 7

Figure 7. The “pedestrian slab” style of design was blamed for the failure of modernist urban planning projects, but at La Défense the slab is a working structure. The developer adopted spontaneous building development instead of applying the complete architectural plan, enabling the formation of a dense local economy.

Because of the high costs and other complexities involved in producing networks for modern transportation systems it is not possible to practice a purely negative and subtractive process of street formation. However the network structure must still be an evolved structure that is produced with feedback from lot development instead of building an entire grid before it has been decided what size of lot is needed. Most importantly all forms of movement must be in balance in the street design so that one type of network structure does not cut another and prevent the network formation process. (Salingaros, 1998)

The cultivation of a spontaneous city

Once a network structure is in place the process of network formation can begin.

Wiki systems have shown that simple freedom to create does not necessarily produce networks unless there also exists a simple interface to this network. The World Wide Web provided a system of linked websites that could spontaneously produce an encyclopedia for many years before the Wikipedia system catalyzed the distributed knowledge of millions of people into an exponentially growing and internally coherent system. The creation of crowd-catalyzing systems has since been named “crowdsourcing.” Translating crowdsourcing principles to planning processes, Alexander described in The Oregon Experiment how an institution could directly support the spontaneous development of its city by providing designers and managers to assist individuals and realize the program that the individual users have in mind. (Alexander, 1975)

With the initiative for developing new building programs left deliberately undefined and in the hands of the individuals and organizations that develop the socio-economic networks of the city, there remains the issue of producing a geometrically coherent landscape that is harmonious and distinctive. This is accomplished with shared generative processes, (Alexander, 2004) and particularly the nesting of generative processes into one another (also known as a shape grammar or form language), as shown in figure 8.  No matter what configurations of space are required by any individual building program, if this configuration is realized physically by the same building process as for any other random configuration then the two realized buildings will share symmetric properties and the result will be a harmonious geometric order. This has been employed in many instances by the regulation of construction materials, which creates a geometric order at the scale of texture, but it also applies for any other scale of geometry, as evidenced by the geometric order created by the advertisements in Times Square.

Figure 8

Figure 8. Three volumes are randomly defined in space without relation to each other. When a shared feedback function is applied to transform these volumes the volumes become related by these transformations. The function in this case is: 1 – Cut out the top corners to half the volume’s height, 2 – Raise the center of the roof.

By defining construction processes instead of fixed building designs it is possible to plan for future growth without eliminating spontaneous growth and feedback. A developer that is initiating a program of emergent urbanism can therefore prepare for construction in advance of any projects having been determined. Building high-technology structures is a complex art that requires significant expertise and a skilled workforce. The developer that creates adaptive building processes that can be used to generate and realize building plans easily and rapidly will provide the same spontaneity as squatter settlements achieve.

As evidenced by the popularity of historic towns of Europe and particularly the Mediterranean as tourist destinations there is enormous demand for and profit to be made from cities that adopt the geometry of emergent cities. For this to work however the development and banking industries must be persuaded of the effectiveness of process design as opposed to master planning, and the municipal authorities must be willing to approve urban design with no fixed configuration. (Alexander, 2004) Political issues also create a significant obstacle. The long approval processes that one must go through to develop a new city or neighborhood have significantly increased the length of the feedback loops and favored large-scale development as well as made small communities less competitive. Even when long review or public consultation processes can be avoided, a development has to comply with weighty subdivision and building codes that consume time to absorb and understand, and in so doing contribute to lengthening the feedback loops and making the urban tissue less adaptive and less sustainable.

References

Alexander, Christopher (1975). The Oregon Experiment, Oxford University Press, USA
Alexander, Christopher (2004). The Process of Creating Life, The Nature of Order Vol. 2, Center for Environmental Structure
Salingaros, Nikos (1998). ‘Theory of the Urban Web’, Journal of Urban Design, vol. 3, also in Chapter 1 of PRINCIPLES OF URBAN STRUCTURE, Techne Press, Amsterdam, Holland, 2005.

Planning for nomads

Almost half of Americans want to live somewhere else. Even for a nation known for its exceptional mobility, the fact that people are not only moving in pursuit of employment opportunities but are looking to move simply because they hate the place they live in reveals a much deeper problem. Economic opportunity is no longer what keeps people moving, it is what keeps them immobilized. Given the same opportunity they would relocate to the kind of place where life is good. Once the economic value of a region has been fully used up, people move on. That is the lifestyle of nomads.

Americans’ feelings of nomadism express the lack of control they have over the shape of their environment. This control was long taken away (with good intentions) to a higher level, planning. Planning by governments, planning by commissions, planning by land developers and Homeowners’ Associations. Planning works, ironically, by preserving the status quo and preventing anyone unauthorized from restoring a built equilibrium. It defines what form a city is to take and locks it up under the control of boards and committees. Because they cannot make their neighborhoods their home and move the fabric of their environment, extending their roots into it, households opt for the next best choice: moving themselves somewhere that fits them more.

When people are no longer responsible for producing their community, they no longer feel any attachment to it. There is no longer any pride of ownership the way that homesteaders who built upon the land were proud of their estate. All that remains are consumers of planning who move from one product to the next as they search for a place that feels like a community. Often that means the countryside, which by grace of having small economies has never been able to support much planning.

Participatory processes, whether they are called “participatory democracy” or “charrettes”, have been the main focus of planning theory for the past decades. The idea was that if people could be involved in the decision process to define the planning of a town this would make such a place their own, but it is no less of a surrender of control, a collective plan. Once the plan has been set, there is no repealing it. Better hope that they got it perfectly right. The inverse process is much more likely to tie people to their community. A town design that is conceived in a studio somewhere far away with zero public input, but that deliberately empowers the local citizens to transform their environment upon its realization, will realize the community’s aspirations and the individual’s dream. This fact ultimately makes the notion of bottom-up versus top-down design meaningless. Who knows whether the lone inventor of an emergent design, who gathers the input of an entire community in order to build it, is running a top-down or bottom-up process?

There is a commonly accepted idea that a good growth policy is giving free reign to land speculators. Although that creates many economic opportunities for people to find work, it doesn’t create the opportunity to build a good life. It will lay the foundation for a city of nomads who pass through to consume as much as they can of the place until they have the chance to move on somewhere else. This may be a growth policy but it will never be a community development policy, unless what is being served is the community of land speculators. A good growth process makes it equally simple for any member of the community, big or small, to transform its fabric. The best growth process will make this simple while creating a beautiful place from all of these individual changes. A city that adopts such a process will not only attract economic growth but also community growth. This balance in growth is the fundamental meaning of sustainable development.

What it will take to start this process is not gymnasiums full of shouting people, but visionary leadership. Only when the top-down drives the bottom-up is a balance achieved.