Intending to find a new form of social production and revitalize the space, the PAV Foundation has promoted the use of vacant plots with the "Medusa" intervention, designed by the architecture studio Collectif Xenia (Pierre Musy and Romain Iff) and architects Gauthier Füllemann and Denis Sermaxhaj, located in Geneva, a Swiss city on the southern tip of the vast Lake Geneva.

The intervention reactivated the space with an interpretation that breathes life into a context dominated by industrial monumentality, presented as a contrast to the industrial, real estate, and financial densification that characterises the area.

"Medusa," conceived by Collectif Xenia (Pierre Musy and Romain Iff) and architects Gauthier Füllemann and Denis Sermaxhaj, evokes movement, encounter, and the alteration of the atmosphere with an ephemeral intervention, designed as a multi-act work involving a crane, a veil, and a group of performers.

The proposal was executed by the slow movement of the crane, while the veil slides through a parking lot, giving way to a change in perception and transformation of the space for those who visit the place.

«Medusa» por Collectif Xenia, Gauthier Füllemann y Denis Sermaxhaj. Fotografía por Pierre Marmy.

«Medusa» by Collectif Xenia, Gauthier Füllemann and Denis Sermaxhaj. Photograph by Pierre Marmy. 

Project description by  Collectif Xenia, Gauthier Füllemann and Denis Sermaxhaj

The PAV Foundation has been entrusted with the land owned by the State of Geneva, which possesses the majority of plots covering the Praille, Acacias, Vernets area.


Since the early 1900s, in order to foster the canton’s industrial development, the State has made its estates available through «droits distincts permanents », thereby separating land ownership from building ownership.

«Medusa» por Collectif Xenia, Gauthier Füllemann y Denis Sermaxhaj. Fotografía por Camille Wetzel.
«Medusa» by Collectif Xenia, Gauthier Füllemann and Denis Sermaxhaj. Photograph by Camille Wetzel.

However, this access to property is limited in time, with a fixed duration of up to one hundred years. Once this period expires, the usage rights are revoked, and any buildings erected on the land revert by law to the landowner.

This particular framework of land management and property access has led to the current situation, where portions of territory, once fertile and dedicated to agricultural production, later converted into industrial halls, are now emptied of their uses. They quietly await the arrival of a new form of social production, carried by the urban project of the future PAV district.


«Medusa» por Collectif Xenia, Gauthier Füllemann y Denis Sermaxhaj. Fotografía por Camille Wetzel.
«Medusa» by Collectif Xenia, Gauthier Füllemann and Denis Sermaxhaj. Photograph by Camille Wetzel.

In the meantime, these industrial wastelands yearn to regain meaning, to be reinvested by life and by people seeking alternative and distinctive spaces for creation, which are above all financially accessible, something that the city, saturated by the market, rarely offers elsewhere. They also take advantage of a brief moment of freedom, between two regimes of property.

In this landscape dominated by massive, motionless industrial silhouettes, life slowly begins to move again thanks to the arrival of a performance. It is within this context that medusa comes to life, an intervention by collectif xenia (Pierre Musy and Romain Iff), with Gauthier Füllemann and Denis Sermaxhaj.


«Medusa» por Collectif Xenia, Gauthier Füllemann y Denis Sermaxhaj. Fotografía por Pierre Marmy.
«Medusa» by Collectif Xenia, Gauthier Füllemann and Denis Sermaxhaj. Photograph by Pierre Marmy. 

Conceived as a play in several acts, the project orchestrates a precise dialogue between a crane, a veil, and a group of dancers. A luminous crane unfolds slowly, once a symbol of urban transformation, it is here diverted from its original purpose. Its slow, deliberate movement lifts a veil, a catalyst for metamorphosis, which glides gracefully through the raw space of a parking lot, subtly transforming the atmosphere and the interactions that unfold along its path.


Moments of exchange and conviviality emerge in its wake. The project positions itself in counterpoint to the real estate and financial densification shaping the district. As towers rise, in this territory negotiated between the State and private investors, medusa occupies the interstitial spaces of waiting, those temporary voids left open between two construction phases.


«Medusa» por Collectif Xenia, Gauthier Füllemann y Denis Sermaxhaj. Fotografía por Camille Wetzel.
«Medusa» by Collectif Xenia, Gauthier Füllemann and Denis Sermaxhaj. Photograph by Camille Wetzel.

At the scale of a neighborhood dominated by industrial monumentality, the project seeks to refocus attention on another dimension, that of the individual, the body, movement, and encounter, while also questioning the slowness of such neighborhood transformations, exploring ways of designing with the ephemeral to respond to the immediate needs and desires.

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Architects
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Collectif Xenia. Lead architects.- Pierre Musy and Romain Iff. 
Gauthier Füllemann, Denis Sermaxhaj.

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Collaborators
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Performers.- Isabelle Brambilla, Sofia Rodrigues, Elio Lamacchia.

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Dates
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2024.

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Location
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Geneva, Switzerland.

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Photography
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Pierre Marmy, Camille Wetzel.

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Collectif Xenia is an architecture collective founded in 2022 by Michel Kessler, Pierre Musy, and Romain Iff, three architects based in Zurich and Geneva. The studio focuses on the concept of hospitality and the inclusion of foreigners in its broadest sense. Together, they explore architecture's potential for community building by activating public space through ephemeral, symbolic, and social formats. Their practice ranges from architecture and landscape competitions in Switzerland to international workshops, public rituals, and research-based installations.

Pierre Musy is a Geneva-based architect and videographer. A graduate of ETH Zurich, he has worked with Baukunst and BUREAU, and co-curated the independent art space BELLA. His film Desert of the Real was presented at the Lugano Territorial Biennial (2022). In 2024, he led the Sample Architecture workshop at the Winter School of the École d’architecture de la ville & des territoires Paris-Est.

Romain Iff is an architect from La Chaux-de-Fonds and a graduate of ETH Zurich. He has worked for Ciguë (Paris) and Jan Kinsbergen (Zurich), contributing to projects such as the Pavillon de l’Arsenal and the Campus Santé in Lausanne. His work has been exhibited at Arc-en-Rêve and Archizoom. In 2024, he led a workshop in Paris-Est and co-curated the Midnight Spaces event in Geneva.

Michel Kessler is a Zurich-based architect and founder of michel.kessler+associates. His work addresses infrastructure, geopolitics, artificial intelligence, and new materials. He was awarded the Foundation Prize for Innovation in Architecture 2024 and selected for the INCA residency (EU Horizon). His projects have been exhibited at the Venice Biennale, Sonic Matter, and GTA Exhibitions. He is curator of the alternative space Lathouse and co-founder of Xenia.

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Gauthier Füllemann is an architect from the Haute école du paysage, d’ingénierie et d’architecture de Genève (HEPIA), who completed his Bachelor of Architecture between 2015 and 2019, and subsequently obtained his master's degree in Architecture at the University of Italian Architecture (USI) in 2021. Studies at the Academia de Arquitectura de Mendrisio, consolidating a training oriented to the experimentation of materials and the relationship between the constructed environment and human beings.

His work combines poetic sensitivity and technical rigour, exploring stone, wood, metal and materials to materialize architectural ideas. Collaborating with collectives like Xenia, we worked on projects that addressed inclusion, hospitality and public space with a participatory approach.

From 2023 formed part of the team of SoaresJaquier Architects, participating in competitions and public projects, and contributing with technical information like the “Jury Report” in Broc, Suiza. Its work reflects a constant compromise with spatial quality, material innovation and architectural project integration in its social and natural context.

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Denis Sermaxhaj (1992) is a Swiss architect based in Geneva. He studied at the Geneva School of Landscape Engineering and Architecture (HEPIA) (2019) and subsequently obtained an MSc in Architecture from the University of Italian Switzerland (USI) (2024).

His work has a social and environmental focus, exploring the links between built space and community. Since 2023, he has run his own practice, Denis Sermaxhaj Architecte, in Châtelaine, Geneva, and has participated in numerous competitions and public projects, including collaborations with established firms such as Pierre-Alain Dupraz Architectes on the Cité de la Musique in Geneva.

His work reflects a consistent commitment to spatial quality, material innovation, and the integration of architectural projects within their social and urban context. Furthermore, he has been involved in collective projects that promote participation and inclusion, consolidating his practice as a sensitive and committed architect.

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Published on: November 15, 2025
Cite:
metalocus, SARA GENT, CAMILA DOYLET
"Ephemeral alteration. "Medusa" by Collectif Xenia, Gauthier Füllemann and Denis Sermaxhaj" METALOCUS. Accessed
<http://www.metalocus.es/en/news/ephemeral-alteration-medusa-collectif-xenia-gauthier-fullemann-and-denis-sermaxhaj> ISSN 1139-6415
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