Category: New Mexico

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Betil Dagdelen: Rammed Earth Side Tables

Betil Dagdelen

Betil Dagdelen is a Turkish artist born in 1978 that specializes in combining traditional weaving techniques and practices with a more improvisational strategy in her patterning. Dagdelen studied at Koc University, located in Istanbul, and graduated with a Bachelors in political science and international relations. She however, also attended design classes and used inspiration from her life to work on furniture design. Currently, Betil works in New Mexico, on the design and weaving of furniture in order to study and understand patterns, particularly through the use of already existing materials that she believes have a story to them, for example yarn that was created traditionally. 

 

 

A lot of her work is displayed at the Cristina Grajales Gallery in New York. One of her exhibitions presented there is called OFF BY AN INCH, where part of the work presented includes the use of rammed earth to create side tables. 

In this gallery showing, Betil brings together history and the art of weaving, she creates solid structures and then weaves around them to create and elevate the structural design of furniture. In these works Betil brings together modern design with a more traditional weaving method in order to have both a visual and tactile experience. 

In this specific gallery showing, Betil includes three side tables made from rammed earth, continuing her exploration of patterns present in furniture design. In this case the rammed earth material, allows for an exploration of those combinations between texture, pattern, and material.

Rammed Earth Side Table A
Rammed Earth Side Table B
Rammed Earth Side Table C

These three side tables are all made from the same materials, which are pumicecrete, portland cement, natural dyes, and lime. Additionally, these three side tables are part of the specific section on Pattern Studies in her showing, where the material element, in this case rammed earth, was used to explore how patterns present themselves differently through technique and design using the same material components.

Resources

https://cristinagrajales.com/artists-designer/betil-dagdelen/

https://cristinagrajales.com/collection/rammed-earth-side-table-c/

https://cristinagrajales.com/exhibitions/off-by-an-inch/

https://cristinagrajales.com/collection/rammed-earth-side-table-a/

https://cristinagrajales.com/collection/rammed-earth-side-tables/

https://betildagdelen.com/mp_01_v2

https://www.instagram.com/betildagdelen/

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Earth USA

Earth USA is the biennial international conference on earthen architecture organized by Adobe in Action (AinA) in Santa Fe, New Mexico. It brings together architects, engineers, builders, and researchers to share advances in clay-based construction. Earth USA began in 2003 as “Adobe USA,” first held at Northern New Mexico College by the Adobe Association of the Southwest and dedicated to Paul Graham McHenry, and it has continued on a biennial basis since then. In 2011, the name formally changed to Earth USA for the sixth conference, held in Albuquerque, and since 2013 all subsequent conferences have taken place in Santa Fe. Key milestones include the adoption of a broader earthen-material scope beyond adobe, as well as expanded international participation.

The Scottish Rite Center hosts the conference, reinforcing the event’s Southwestern adobe heritage. The Santa Fe venue also underscores the material focus: the Alhambra Theater is a pink adobe stucco building, and local expertise in adobe construction is abundant. Site tours have included Pueblo ruins, ancestral Spanish missions, and owner-built adobe homes throughout northern New Mexico. Typical Earth USA activities have featured on-site workshops, such as plastering demonstrations, as well as earthen installations; for example, past Earthbuilders’ Guild teams have built mud-brick stages and art displays on-site. In sum, the conference’s materials and form revolve around clay-rich architecture, celebrating both the traditional thick earthen walls of Santa Fe’s historic districts and cutting-edge earth technology.

Earth USA is run by AinA, a New Mexico 501(c)(3) nonprofit organization dedicated to adobe and earthen-building education. AinA was founded by Mike Lopach and launched Earth USA to empower owner-builders. For Earth USA 2026, AinA’s Lisa Morey and Dan Krause co-preside on the board of AinA, and the Executive Director is Kurt Gardella, a certified adobe instructor who studied under Quentin Wilson at Northern New Mexico College. Gardella holds adobe construction certifications and leads AinA’s certificate program. He has been “a major organizer of Earth USA” while also teaching owner-builder courses. Lisa Morey is a civil engineer and designer, and co-founder of Colorado Earth LLC. She is the author of Adobe Homes for All Climates and holds a patent for reinforced adobe brick walls. Dan Krause is a retired ASU professor who became enamored with adobe while living in Arizona. He designed and built two of his own adobe homes, earning AinA’s Adobe Construction certificate in 2020. Collectively, the organizers combine academic and practical expertise to network experts, educate practitioners, and advance earthen construction worldwide. 

Each Earth USA conference follows a structured program with three days of presentations and posters, along with associated social and field activities. The format typically includes a Friday welcome keynote, all-day podium and poster sessions from Friday through Sunday, and Sunday afternoon tours to regional earth-building sites. For example, Earth USA 2024’s schedule featured invited talks on topics ranging from flood-proof adobe shelters to waste-earth reuse and seismic earth block design, alongside panels on owner-builder case studies and clay plaster techniques. All conferences include a Friday night reception sponsored by the Earthbuilders’ Guild and guided tours to adobe missions, historic homes, and new earth projects on Sunday. The scope of subjects is broad, and organizers note that the program reflects a wide field of interest, including adobe, rammed earth, compressed earth block, cob, and essentially any method that uses clay as a binder.

Key themes encompass the use of sustainable materials, including earth plasters and stabilized blocks; advancements in modern fabrication techniques such as 3D printing and robotics in earthen architecture; building science considerations ranging from thermal performance to seismic resilience; historic preservation; and social projects focused on affordable housing and owner-builder training programs. For instance, Earth USA has featured a keynote from, “Mud Frontiers,” by Ronald Rael (UC Berkeley) on 3D-printed earth architecture, as well as a session on a Ghanaian rammed-earth housing prototype, “Kente House,” by Angeles Hevia. Other sessions have addressed codes and policy, including Ben Loescher on U.S. earthen masonry standards and Stephen Colley on adopting adobe in building codes. Topics also include education, such as introducing clay into architecture curricula, and innovation, including rotational tampers for rammed earth.

Earth USA is attended primarily by architects, engineers, and builders interested in sustainable construction, but also by anthropologists, code officials, and environmental advocates. The gatherings are intentionally international and multidisciplinary, as reflected in a speaker roster that includes talks on building practices from India, Japan, and Norway. Attendees leave with a sense of community, supported by nightly informal receptions and a vibrant email newsletter, EarthUSA News, which keeps participants connected year-round. In sum, Earth USA operates as a volunteer-driven conference in which the organizing committee handles logistics and content curation, while academic partners disseminate the findings.

The program is fully documented in the conference proceedings and often carries American Institute of Architecture (AIA) continuing-education credits. Speakers come from universities, nonprofits, governments, and industries worldwide, and recent years have seen participants from 15 to 20 countries. Poster sessions provide a venue for shorter papers on topics such as material testing, vernacular research, and life-cycle analysis. Throughout, the conference emphasizes process, including peer-reviewed abstracts, international volunteer committees, and field demonstrations, as much as the building form itself. Many sessions delve into construction processes such as mix design, compaction, and curing, while others focus on form-finding and earth structures shaped by heritage or innovation.

As an organization, AinA solicits abstracts internationally through a call for papers reviewed by experts and publishes proceedings. For 2026, for instance, abstracts were due in February 2026 and full papers in June 2026. Registration is open to professionals, students, and owner-builders. Earth USA’s inclusive approach is also reflected in its leadership; for example, owner-builder Ethan Novikoff both presented and served on the AinA board, bridging practitioner and organizer roles. Sponsorship comes from allied nongovernmental organizations and firms such as the Earthbuilders’ Guild, the SFCC Adobe program, supporting organizations, and architecture firms.

Earth USA presents a clear consensus that earthen materials are inherently sustainable, resilient, and culturally rich. Many presenters emphasize earth’s low carbon footprint and ease of reuse, as well as its climate-comfort benefits, thermal mass, and humidity buffering. There is a shared mission to reclaim these traditional techniques in a modern context. From an architectural perspective, the conference inspires both reflection and action. It demonstrates how ancient building methods can inform contemporary design, for example, how Pueblo-style thick walls inspire passive climate control, or how combining fibers and modern stabilizers can make cob livable in cold regions. On the technological side, sessions on 3D-printing clay and new tamping machines point toward a future in which even large-scale earth building is industrially feasible. The Earth USA community also exchanges practical solutions; one talk, for instance, detailed how to guide a cob house through building inspections, while others described integrating adobe into U.S. building codes. In conclusion, Earth USA galvanizes the earthen-construction movement. It has inspired new international collaborations, spurred educational initiatives, and reinforced advocates’ resolve to promote sustainable, beautiful architecture that can be made from the ground.

Citations:

  1. https://www.earthusa.org/
  2. https://www.adobeinaction.org/earth-usa-conference
  3. https://www.adobeinaction.org/
  4. https://www.earthusa.org/earthusa-news/2021/10/07/earthusa-news-bridge-issue
  5. https://www.adobeinaction.org/paul-mallory-project
  6. https://visioncreationadobe.com/2018/01/20/building-adobe-walls-in-winter/
  7. https://www.adobeinaction.org/board-of-directors#:~:text=Kurt%20Gardella%20specializes%20in%20online,Certification%20from%20The%20Earthbuilders%27%20Guild
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Solar Adobe: Energy, Ecology, and Earthen Architecture

Solar Adobe: Energy, Ecology, and Earthen Architecture by Albert Narath

Against the backdrop of a global energy crisis, a widespread movement embracing the use of raw earth materials for building construction emerged in the 1970s. A new book, Solar Adobe: Energy, Ecology, and Earthen Architecture by Albert Narath , examines this new wave of architectural experimentation taking place in the United States, detailing how an ancient tradition became a point of convergence for issues of environmentalism, architecture, technology, and Indigenous resistance.

Utilized for centuries by the Pueblo people of the American Southwest and by Spanish colonialists, adobe construction found renewed interest as various groups contended with the troubled legacies of modern architecture and an increasingly urgent need for sustainable design practices. In this period of critical experimentation, design networks that included architects, historians, counterculture communities, government weapons labs, and Indigenous activists all looked to adobe as a means to address pressing environmental and political issues.

Albert Narath charts the unique capacities of adobe construction across a wide range of contexts, consistently troubling simple distinctions between traditional and modern technologies, high design and vernacular architecture. Drawing insightful parallels between architecture, environmentalism, and movements for Indigenous sovereignty, Solar Adobe stresses the importance of considering the history of the built environment in conjunction with architecture’s larger impact on the natural world.

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N. Dash

N. Dash was born in Miami Beach, Florida, in 1980. She earned a BA from New York University in 2003 and an MFA from Columbia University, New York, in 2010. Now, Dash lives and works in New York and Taos County, New Mexico.

Dash’s work in sculpture, painting, and photography is the product of a unique, multipart creative practice that seeks to register lived experience and bodily intelligence through material. Her works, primarily made of natural items such as linen and adobe, give physical form to the intangible and the imagined.

During 2010 to 2020, N. Dash’s work started to be included in group exhibitions in many different museums. Dash also has presented solo exhibitions at White Flag Projects, Saint Louis (2013) and Hammer Museum, Los Angeles (2014–15).

In 2022, N. Dash has one solo exhibition in Europe at Stedelijk Museum voor Actuele Kunst (S.M.A.K.), named “earth”. In this exhibition, she still uses what could be considered common materials, such as jute, mud, and string. But the earth referenced in the exhibition title is a constant, often used as a ground, which is a capstone in earth art.

Dash composes her works—which are usually Untitled—using discrete units, never disturbing the integrity of a given unit. Her works always used nature material and create without meaning which explains that “Art can be no meaning.” By looking her works in two different viewing positions, people can get very different feeling.  For example, this work named Unititled, looks like a light-blue panel is placed high up on the wall, and it is only when we move in closer that we perceive the skeins of string that are suspended from the panel. This kind of formal play has charged undertones in our time. The subjection of the natural world to the present economy of images transposes materials into essentially aesthetic contexts.

 

Citation

 

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Taos Pueblo

 

Pueblo de Taos
© Edmondo Gnerre
https://whc.unesco.org/en/list/492/gallery/

Taos Pueblo is an ancient, occupied multi-generational community in Northern New Mexico. “Pueblo” refers to both the physical buildings and community (stylized “pueblo”) and the native people of those communities (stylized “Pueblo”). The people are also known as Puebloans, or Pueblo peoples, and are native to the Southwestern United States (New Mexico, Arizona, Texas). They share a common culture, including food and agriculture, history, traditions, and religious practices. Aside from Taos, inhabited pueblos include San Ildefonso, Acoma, Zuni, and Hopi.

Taos Pueblo
© OUR PLACE The World Heritage Collection
Author: David Muench
https://whc.unesco.org/en/list/492/gallery/

The most recognizable feature of the Taos Pueblo community are the multi-story, red clay and adobe homes and community buildings. They span both sides of the Sacred Blue Lake/Rio Pueblo de Taos (a tributary of the Rio Grande) which is also the population’s only source of water. The community has been continuously occupied for over 1000 years, likely originally built between 1000 and 1450 C.E. It is both the longest continuously inhabited community in the United States, and the largest of the pueblos.

Taos Pueblo
© OUR PLACE The World Heritage Collection
Author: David Muench
https://whc.unesco.org/en/list/492/gallery/

The structures are built in terraced tiers, extending out as they descend toward the ground, and a height of five stories at maximum. “The property includes the walled village with two multi-storey adobe structures, seven kivas (underground ceremonial chambers), the ruins of a previous pueblo, four middens, a track for traditional foot-races, the ruins of the first church built in the 1600s and the present-day San Geronimo Catholic Church” UNESCO. The community sits at the base of the Taos mountains, the Sangre de Cristo range of the Rocky Mountains

old-taos-images-historic-museum-of-taos-015
https://taospueblo.com/history/

Spanish explorers arrived in 1540 C.E. and originally believed the community to be one of the Seven Golden Cities of Cibola, a legend of Aztec mythology pursued by Coronado, among others. The miccaceous mineral (micca) found in the clay that is used to re-mud the homes every year shimmers in the light, seemingly like gold.

It is an occupied, inhabited, living community, with dwellings passed on within the family from eldest son to eldest son throughout generations. Taos Pueblo is recognized as both a U.S. National Historic Landmark and a UNESCO World Heritage Site. Visitors are welcome, but as an occupied space, access is limited to businesses and tourist centers, and photography of certain parts of the physical community and people is limited. The tribal land encompasses 95,000 acres with about 4,500 inhabitants. Approximately 150 people lived in the historic pueblo adobe dwellings as of 2010.

old-taos-images-historic-museum-of-taos-008
https://taospueblo.com/history/
old-taos-images-historic-museum-of-taos-003
https://taospueblo.com/history/
old-taos-images-historic-museum-of-taos-002
https://taospueblo.com/history/
Google Earth 3D aerial of Taos Pueblo buildings
Google Earth aerial of Taos Pueblo land

REFERENCES

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Rudolph Schindler’s Adobe House Design in Taos, New Mexico

R. M. Schindler in Taos, October 1915. Photographer likely Victor Higgins. Courtesy UC Santa Barbara Art Museum, Architecture and Design Collections, Schindler Collection.

Rudolph Schindler was an Austrian architect that practiced in Southern California from 1920 to 1953. [1] Starting as a talented student at the “Wagnerschule” in Austria, Schindler became a pioneering figure in 20th-century modern architecture, ultimately emerging as one of the most significant influences of the Modern Movement in America. Rudolph was born in Austria but spent most of his life in the United States, establishing his identity as a “Californian architect”[2].

Nevertheless, Rudolph Schindler generally surpasses many boxes attributed to him with a term he championed in his work: space architecture, in which he sought the protagonism of materials into a “new architecture”[2]. Materials like adobe!

His country house in adobe project is the result of a trip to Taos, New Mexico in which Schindler allowed the Southwestern scene to fill his sketchbooks and camera films, influencing his designs and eventually his style[3]. 

Photograph taken by Schindler in 1915. Courtesy of New Mexico Architecture Magazine.

His sketches and photographs reveal a delicate eye sensitive to tradition in Southwestern America, and inevitably an understanding of the nature of this material[3]. Delineated lines in his sketchbook represent the characteristic irregular bulk of adobe walls, and his photographs show his interest in how adobe ultimately shapes space[3]. 

Sketch made by Rudolph Schindler in New Mexico. Courtesy of New Mexico Architecture Magazine.

These observations hung onto Schindler when he was commissioned to design a summer house for a client, Dr. T. P. Martin in a site spanning approximately 3 acres, set against the scenic backdrop of Taos, New Mexico. [4]

Taos Pueblo, October 1915. Photograph by R. M. Schindler. Courtesy UC Santa Barbara Art Museum, Architecture and Design Collections, Schindler Collection.
House Floor Plan Design by Schindler. Courtesy UC Santa Barbara Art Museum, Architecture and Design Collections, Schindler Collection.

In his proposed plan, Schindler advocated for a modernization of the Spanish Pueblo vernacular architecture he discovered featuring ADOBE, to draft his “Country Home in Adobe Construction” design that stretched horizontally within the site[4]. While the house plan did not model local tradition with its reigning symmetric layout, his material of choice, adobe, allocated him the freedom to explore what he inevitably noticed in his trip to Taos: the versatility of the material [3]. His design therefore probes the fundamental thickness of the adobe walls in the deep recesses of the windows and reveals adobe’s inherent lack of rectangular precision with the uneven surfaces of the walls[3].

As planned, his proposed layout sought to integrate harmoniously with the landscape as a low-rise adobe structure with viga ceilings and a large courtyard[4].

Perspective of Design by R.M. Schindler. Courtesy UC Santa Barbara Art Museum, Architecture and Design Collections, Schindler Collection.

This design never came to fruition, but the lessons that Schindler absorbed from New Mexico fundamentally embedded his designs with a vision he could only learn from the South, architecture as a question of space formed through materials[5]. 

“When I speak of American architecture I must say at once that there is none. . .The only buildings which testify to the deep feeling for soil on which they stand are the sun-baked adobe buildings of the first immigrants and their successors — Spanish and Mexican — in the south-western part of the country.”   

Letter from RMS to Richard Neutra, Los Angeles, California, ca. January, 1921: quoted in E. McCoy, Vienna to Los Angeles: Two Journeys (Santa Monica, Arts & Architecture) [6]

Citations

[1]”R.M. Schindler.” Los Angeles Conservancy, www.laconservancy.org/learn/architect-biographies/r-m-schindler/. Accessed [09/22/2024].

[2] Riemann, Joshua. “Rudolph M. Schindler : theory and design” Massachusetts Institute of Technology, 2012, dspace.mit.edu/handle/1721.1/79933

[3]Gebhard, David. “R.M. Schindler in New Mexico” New Mexico Architecture Magazine, vol. 7, no. 1, 1965.

[5] Blackman, Harrison. “The Art of Design, the influence of a place : the Emergence of Pueblo Revival Architecture in New Mexico.” Taos News, 30 May 2018, www.taosnews.com/magazines/the-art-of-design-the-influence-of-a-place-the-emergence-of-pueblo-revival-architecture/article_f56e3b41-8379-54a8-b424-df4770e8416d.html.

[4]Schmidts, Hannah. “Deep Dive: Rudolph M. Schindler’s Take on Californian Architecture.” New Classics, 13 July 2020, www.newclassics.ca/blogs/journal/deep-dive-rudolph-m-schindler-architecture?srsltid=AfmBOoqlF6sNPy0xk1V8ypxbl6XSa_-lTbYHs1OQjgR5SPz0QWbFu9sj.

[6] “R. M. Schindler and Richard Neutra: Space Architecture and the Pueblo” Southern California Architectural History, 18 May 2019, socalarchhistory.blogspot.com/2019/05/schindler-wrote-to-neutra-extolling.html

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La Luz

modern adobe fence in front of glass and geometric rooftop bifurcated with cylindrical column against a blue cloudy sky
Credit: Mhd Alaa Eddin Arar

La Luz, designed by Antoine Predock, is a planned townhouse community that blends modern architecture with materials that reflect the cultural heritage and traditional building practices of the southwest region. Located in Albuquerque, New Mexico, on open land between the Rio Grande and the Sandia Mountains, La Luz was conceived by Predock in 1967 and completed by 1974.

The development features 96 townhomes, ranging from 1,500 to 2,100 square feet, clustered together with 16-inch thick adobe walls. This design choice not only pays homage to traditional Southwestern architecture but also serves a functional purpose by providing excellent thermal mass for passive climate control.

La Luz MasterPlan from aerial view in black and white that illustrates rows of townhouses, streets and community amenities like tennis courts, pool, and green spaces
Credit: Antoine Predock Architect PC

The townhouses in La Luz’s layout are oriented eastward, offering residents picturesque views of the Sandia Mountains and morning sun, while the western facade features mostly blank walls to shield against harsh afternoon sun and dust storms. Private courtyards act as solar traps in winter and provide shade in summer.

distant view of adobe townhouses in front of mountains and surrounded by desert grasses
Credit: Jerry Goffe

The site design is inspired by the architectural heritage of Native pueblos and Hispanic villages in New Mexico and is accentuated with curved walls, which soften the overall aesthetic and mirror the natural contours of the landscape.

The development contributes to a sense of community through the inclusion of shared green space, fountains, pedestrian paths, tennis courts, and a swimming pool. La Luz also preserves 40 acres of untouched land as a permanent natural preserve.

La Luz, with its adobe-inspired design, became the cornerstone that cast Predock into the national spotlight and lay the foundation for the recognition he received in the American architectural field.

Despite not being a native of New Mexico, Predock considered Albuquerque his spiritual home and the place that shaped his architectural vision.

wide angle photograph of the architect, a white male with black shirt and pants surrounded by small scale building models
Credit: Antoine Predock Architect PC

Born on June 24, 1936, in Lebanon, Missouri, Predock’s architectural journey began while taking a technical drawing course taught by Professor Don Schlegel during his time as an engineering student at the University of New Mexico. This experience compelled Predock to transfer to Columbia University to pursue his B.A. in architecture, which he received in 1962.

After graduation, Predock was awarded a traveling fellowship that allowed him to explore Spain, Portugal, and other parts of Europe for two years. After apprenticing, he established his own architectural firm, La Luz was one of the firm’s early projects that highlighted his unique approach toward weaving modernism with the regional traditions of the American southwest.

CITATIONS:

[1] Predock, A. (n.d.). La Luz. Antoine Predock Architect PC. Retrieved from http://www.predock.com/LaLuz/La%20Luz.html

[2] Predock, A. (n.d.). Desert Beginnings. Antoine Predock Architect PC. Retrieved from http://www.predock.com/DesertBeginnings/desertbeginnings.html

[3] Pearson, C. A. (2024, March 4). Tribute: Antoine Predock (1936–2024). Architectural Record. Retrieved from https://www.architecturalrecord.com/articles/16768-tribute-antoine-predock-19362024

[4] Albuquerque Modernism. (n.d.). La Luz Community. University of New Mexico. Retrieved from https://albuquerquemodernism.unm.edu/posts/cs13_la_luz.html

[5] Wilson, C. (2014). La Luz Community. SAH Archipedia. Retrieved from https://sah-archipedia.org/buildings/NM-01-001-0007

[6] Lucas, C. (n.d.). Architect Antoine Predock’s La Luz Community. Chris Lucas ABQ. Retrieved from https://www.chrislucasabq.com/post/flyer-architect-antoine-predocks-la-luz-community-5-tennis-court-nw-87120

[7] Docomomo US. (2022, July 14). The Planned Community of La Luz is Listed on the National Register of Historic Places. Retrieved from https://www.docomomo-us.org/news/the-planned-community-of-la-luz-is-listed-on-the-national-register-of-historic-places

[8] AIA Los Angeles. (n.d.). Antoine Predock, FAIA. Retrieved from https://aiala.com/antoine-predock-faia/

[9] World-Architects. (2024, March 4). Antoine Predock, 1936-2024. Retrieved from https://www.world-architects.com/en/architecture-news/headlines/antoine-predock-1936-2024

[10] American Academy in Rome. (2024, March 6). In Memoriam: Antoine Predock. Retrieved from https://www.aarome.org/news/features/memoriam-antoine-predock

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The McDonald Ranch House

McDonald-Schmidt Ranch House. This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.

The McDonald Ranch House in the Oscura Mountains of Socorro County, New Mexico, was the location of assembly of the world’s first nuclear weapon. The active components of the Trinity test “gadget”, a plutonium Fat Man-type bomb similar to that later dropped on Nagasaki, Japan, were assembled there on July 13, 1945. The completed bomb was winched up the test tower the following day and detonated on July 16, 1945, as the Trinity nuclear test.

The George McDonald Ranch House sits within an 85-by-85-foot (26 by 26 m) low stone wall. The house was built in 1913 by Franz Schmidt and is built of adobe, which was plastered and painted. The plutonium hemispheres for the pit of the Trinity nuclear test “gadget” (bomb) were delivered to the McDonald Ranch House on July 11, 1945.  Text via Wikipedia.