The publication casts new light on the relationship between modernism and the ground, calling into question received assumptions and liberating new possibilities for how a building relates to its site. The result of research PRODUCTORA initiated as winners of the Mies Crown Hall Americas Prize for Emerging Practice at Illinois Institute of Technology, Being the Mountain examines the relationship between architecture and the ground it occupies, an interaction so obvious--a building must touch the ground--that it often remains underexplored. Richly illustrated contributions by Carlos Bedoya, Frank Escher, Wonne Ickx, V ronique Patteeuw, and Jes s Vassallo revisit significant moments in architectural history that cast new light on the techniques and legacies of modernism, especially in settings like Mexico and California, where architects such as Ricardo Legorreta and John Lautner incorporated dramatic natural topography in their agendas. Additional essays investigate the role of the ground in the thought of Kenneth Frampton in the 1980s and Luis Moreno Mansilla in the 1990s, as well as point to important parallels between premodern land practices, twentieth-century art, and today's architecture. Together, these episodes call into question our received assumptions and present new possibilities for the connection between a building and its site. A portfolio of related projects by PRODUCTORA concludes the book, further drawing out the idea of architecture as a form of constructed ground. PRODUCTORA is a Mexico City-based architectural studio founded in 2006 by Carlos Bedoya (1973, Mexico), Wonne Ickx (1974, Belgium), Victor Jaime (1978, Mexico), and Abel Perles (1972, Argentina). The studio's work is distinguished by an interest in precise geometries, the production of clearly legible projects with limited gestures, and the search for timeless buildings. PRODUCTORA has been recognized by the Architectural League of New York with the Young Architects Forum (2007) and Emerging Voices (2013) awards. In 2016, they received the Mies Crown Hall Americas Prize for Emerging Practice from Illinois Institute of Technology in Chicago for the Pavilion on the Zocalo. In 2018, PRODUCTORA was recognized with the Oscar Niemeyer Award for Latin American Architecture for the Teopanzolco Cultural Center, a project realized in collaboration with Isaac Broid. That same project also received the Simon Architecture Prize - Living Places in Barcelona, a recognition organized in collaboration with the Fundaci Mies van der Rohe that celebrates collective places in which public and community life develops. The partners of PRODUCTORA have taught at local institutions such as the Universidad Iberoamericana, the Centro de Dise o, TEC de Monterrey, and the Universidad La Salle in Mexico City as well as international universities such as the University of California, Los Angeles, Illinois Institute of Technology, and Harvard University's Graduate School of Design. In 2011