TWO SUNS ARCOSANTI – Michael Stephen Wills Photography

Arcosanti, the brainchild of architect Paolo Soleri, was conceived as an experimental laboratory for urban design and ecological principles—a built embodiment of his vision of Arcology (a fusion of “architecture” and “ecology”). Over fifty years since its groundbreaking in 1970, Arcosanti remains a significant cultural and architectural artifact. However, the meaning and relevance of both Arcosanti and Arcology in today’s context invite critical examination.

The accompanying photographs are a presentation of the history of Arcology from Arcosanti signage

Arcosanti 5000 — Soleri’s Ultimate Vision

Historical Context and the Vision of Arcology

Soleri’s concept of Arcology emerged during the mid-20th century, an era of increasing environmental awareness, urban sprawl, and population growth. His vision was radical: compact, self-sustaining urban environments that minimized ecological impact while fostering human interaction and creativity. Arcology sought to challenge the sprawling, resource-intensive models of urban development that dominate the modern world.

Today’s population of the Earth is about 5 billion people. By the year 2050 the population of the Earth will be 10 billion people.* With the same human condition of today and the same stresses imposed on the biosphere, there would be the need for 2 Earths. Since the American Dream society has an average per capita “consumption” about 20 times the average per capita consumption of the whole human society, for the 10 billion people of the year 2050 to be “elevated” to the American Dream’s affluence level, there would be the need of 2 x 20 = 40 Planet Earths. Assuming that by then we all will be twice as efficient in our production-consumption-gratification pursuits, we would need only 19 more planets. Where are we going to get 19 additional Planet Earths? The American Dream physically embodied in the single-family house has to be scrapped and reinvented in terms which are coherent with the human and biospheric reality. Toward a Possible Resolution Only a true, lean urbanization strung along a highly efficient, i.e., frugal logistical grid combining superconductivity-maglev transportation of people and freight, viaducts, aqueducts, power grids, sewage and solid waste grids, etc., compensating for the loss of consumption-gratification unlimited by the way of an intense social, convivial, natural, esthetic, productive, sane life; only such novel structure will be able to translate the American Dream into a democratic, planetary reality. The alternative, to persist in the dying American Dream, is a planetary-human catastrophe. The subject matter of this exhibit is about one aspect of the possible resolution. It would couple indissolubly the well-being of Homo sapiens, 10 billion of us, with the well-being of the only planet we can inhabit for the time being. All statistics based on 1993 United Nations data cited by the Worldwatch Institute. (signed) Paolo Soleri

Arcosanti was intended to be a prototype—a proof of concept for dense urban living within a minimal environmental footprint. Its design embraced verticality, integration with natural surroundings, and multi-use spaces to reduce resource consumption. Soleri’s philosophy rejected wasteful consumerism and emphasized communal living, self-sufficiency, and harmony with nature.

Arcosanti as a Realization of Arcology

While Soleri’s ideas were visionary, Arcosanti itself never fully realized its original ambitions. Planned to house 5,000 people, it currently accommodates fewer than 100 residents. This gap between aspiration and reality reflects several challenges:

Paolo Soleri had established his residence and studios in Paradise Valley, Arizona, before he embarked on developing alternative urban theories. Although the Cosanti structures are small, Soleri experimented with various innovative construction techniques, including silt casting, to demonstrate effective use of building materials. His imaginative forms were adapted to the desert environment, and Cosanti became the exploratory launching pad for the Arcosanti project.

Scale and Funding: Building a sustainable community of this scale required vast financial and organizational resources. Arcosanti, largely constructed through volunteer labor and workshops, lacked the momentum to expand at the pace Soleri envisioned.

Upon completion of his theoretical work MESA CITY, whose purpose was the quest for an environment in harmony with man, Soleri established the Cosanti Foundation, a non-profit educational foundation. He was determined to continue his investigations into more efficient urban systems. To demonstrate his theories, Soleri proposed an urban-scale community MACRO COSANTI, envisioned for Arizona high desert.

Cultural Shifts: The communal living and austerity championed by Soleri contrast sharply with the consumer-driven values of contemporary society. The rise of globalized capitalism, suburban expansion, and digital individualism has made the communal ethos less appealing to many.

The term ARCOLOGY was coined to describe a series of urban designs for ecologically sound human habitats, as elaborated in “The City in the Image of Man,” published by MIT Press. This thesis outlines the concept of ARCOLOGY and its design variations for different settings. ARCOSANTI was introduced as the last (30th) example of this exercise, and originally planned to house a relatively small population of 500. The physical construction of ARCOSANTI began in 1970.

Technological Advances: Soleri’s designs were innovative for their time, but modern advancements in sustainable technology—such as solar power, green building materials, and decentralized energy systems—have surpassed some of his ideas. Today, sustainable urbanism focuses on retrofitting existing cities rather than building entirely new ones.

The Relevance of Arcology Today

Despite its limitations, Arcology remains profoundly relevant in the face of 21st-century challenges such as climate change, resource scarcity, and urban overpopulation. Soleri’s principles offer a framework to address these crises, particularly through:

The Xerox Corporation sponsored a major Soleri exhibition featuring a series of new arcology designs that suggested a sustainable urban habitat employing alternative energy sources. The project was called “TWO SUNS ARCOLOGY: The Cities Energized by the Sun.” The Arcosanti master plan went through a major overhaul reflecting this methodology. In the following year, PLANT SHOW venues gave Soleri additional funding to update the Arcosanti design. The projected population was increased to 5,000.

Compact Urbanism: Cities worldwide are grappling with the environmental toll of urban sprawl. Arcology’s emphasis on vertical, compact cities with reduced land usage aligns with the modern push for urban densification.

Ten years into the construction of the first prototype arcology, a developmental adjustment was made in order to gain momentum for the project. The CRITICAL MASS concept was introduced as an incremental phase to house 10 percent of the projected population of 5,000. A series of small-scale structures providing various amenities was designed to support a viable community, a critical population of 500 people. This would hopefully function as a springboard to the next major step, the completion of Arcosanti.

Mixed-Use and Communal Spaces: The COVID-19 pandemic underscored the importance of walkable, mixed-use neighborhoods and shared green spaces. Arcology’s model of integrated living and working spaces anticipates these needs.

Sustainability and Circular Systems: Soleri’s focus on minimizing waste and resource use aligns with today’s circular economy principles. Arcology’s ideas resonate with efforts to design cities as closed-loop systems that reuse resources.

The apse initiative was a result of an expanded version of the Third Generation Arcology using Soleri’s signature forms: Apse and Exedra. This initiative suggests possible solutions to the existing urban renewal opportunities (Presidio, Stapleton, Phoenix, and Hanover Expo 2000) as well as hypothetical rural development opportunities. ARCOSANTI 2000 consists of 3 major units. The design was modified later with an addition of SUPER CRITICAL MASS (THE WAVES), three superstructure apses combined and placed behind Critical …

A Philosophical Challenge: Beyond practical urban design, Arcology challenges us to rethink our relationship with the planet and with each other. It invites a fundamental shift from individualistic consumption to collective stewardship.

Critique of Arcosanti Today

Arcosanti, while iconic, serves more as a symbol than a fully functioning example of Arcology. Its limited population and incomplete development highlight key shortcomings:

Lack of Scalability: Arcosanti has not demonstrated how Arcology principles can scale to meet the needs of modern cities with millions of inhabitants.

ARCOSANTI 5000 2001 – present Developed from the SUPER CRITICAL MASS in ARCOSANTI 2000 with the design elements of NUDGING SPACE ARCOLOGY added, ARCOSANTI 5000 features seven phases of truncated superapse structures. It re-establishes the macro nature of this prototype arcology for 5,000 people. This design is still in development, waiting on the architectural and structural resolutions.

Dependence on External Systems: Despite its aspirations for self-sufficiency, Arcosanti relies on external power grids, supply chains, and tourism, which limits its autonomy.

Cultural Niche: Arcosanti appeals primarily to a niche audience of artists, architects, and environmentalists, making it less accessible or appealing to broader populations.

However, these critiques do not negate its value as a learning tool. Arcosanti’s enduring presence serves as a physical and philosophical case study for those seeking alternatives to conventional urbanism.

A Way Forward?

The future of Arcology lies not in building new Arcosanti-like prototypes but in applying its principles to existing cities and communities. Initiatives such as urban vertical farming, passive solar building design, and car-free city centers echo Soleri’s vision in modern contexts.

Additionally, Arcosanti itself could pivot toward becoming a research hub for sustainable practices, a cultural landmark, or a retreat for those seeking inspiration in Soleri’s ideas. By focusing on education and experimentation, it could remain relevant in contemporary discussions about urbanism and ecology.

Conclusion

Arcosanti and Arcology are more than relics of a bygone architectural movement—they are reminders of humanity’s potential to live in balance with nature. While the practical implementation of Arcology faces significant hurdles, its core philosophy continues to inspire efforts to create more sustainable and harmonious urban environments. In a world increasingly shaped by environmental urgency, Soleri’s vision holds lessons we cannot afford to ignore.

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