How can a building’s energy balance be maintained as a living organism would? The search for solutions has come to the forefront of contemporary concerns, with a view to finding a way for architecture to self-regulate its energy consumption based on uses and the fluctuations of the environment. One of the first surfaces concerned is the building’s façade, which is very similar to the material envelope of a body or the membrane of a cell: an interface between an interior that must be kept in balance and an exterior that is subject to variations the interior must be protected from. Much is at stake in the case of high-rise buildings. The double-tower high-rise “The Link,” which will emerge in La Défense in 2025, is typically subject to various constraints and challenges. To optimize user comfort, an ideal balance must be found between two paradoxical factors: the importance of daylighting and protection against exterior heat.
In order to draw natural light deeper inside the building, the archetypal form of the high-rise tower is called into question. The Link is made up of two cores connected in a figure-of-eight shape, thereby increasing the exchange surface with the exterior and leading to larger surfaces being exposed to direct sunlight instead of having blind elevator shafts at their core, as is typical in high-rises.
An architectural decision was made to open up as many perspectives as possible on the exceptional landscapes of the Seine hillsides, the Bois de Boulogne Park, the rooftops of Paris, and the La Défense skyline, thanks to full-height glazing.
This vast transparent surface, with 360 degrees of exposure to the sun, must however allow for user thermal comfort, as well as reduced energy use. How can natural light then be allowed in but not the heat, all the while preserving the views of the distant horizon? Tinted glass has run its course—it alters the perception of the landscape and generates significant energy consumption as workspaces must be artificially lit even during the daytime.
Based on the interpretation of a solar simulation, PCA-STREAM’s architectural teams, in partnership with the engineering consultancy VS-A, have worked on adapting the façade to its environmental context. They have developed an envelope with variable typologies to address different constraints, with a single skin on the north side and a double skin on the south side, which has the most sun exposure.
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A philosopher and senior lecturer at the National School of Architecture of Marseille, Matthieu Duperrex explores ‘sentinel landscapes’—polluted soils, engineered rivers, industrial port zones—from a decolonial, multidisciplinary perspective attentive to the various ways of narrating the damaged world we have inherited. He regards these sites both as places of warning and as spaces of knowledge.
Raphaëlle Guidée is a specialist in narrative representations of economic, environmental and societal collapse. For over 10 years, she has analyzed the narratives surrounding Detroit’s bankruptcy in order to understand how an apparent ruin of capitalism can inspire discourses of domination or resistance. In La ville d’après : Détroit, une enquête narrative [The Aftermath City: Detroit, a narrative investigation] (Flammarion), rather than focusing on fictions, she seeks out testimonies and concrete stories, believing that modern times don’t need new narratives. We simply need alternative narratives. Read the transcription of her podcast below.
Once a sanctuary for dreams and imagination, nighttime has now been relegated to the mere role of a utilitarian prelude to daytime. Nocturnal realms possess an alchemical power capable of transfiguring our perceptions. However, when viewed through the lens of urban uses, the night also exacerbates inequalities and raises questions about the possibility of achieving an urban night that is accessible to everyone. Exploring the range of possibilities associated with the night reveals it as a space-time where complex interactions are woven that could be revitalized through a chronotopic and inclusive architecture.
Ashfika Rahman is a visual artist based in Bangladesh, who recently won the Future Generation Art Prize awarded by the PinchukArtCentre in Ukraine. Faced with the overwhelming power of information systems that are serving dominant narratives, she is working on creating alternative medium of expression, giving their voice back to marginalized communities in her homeland, particularly women. Through her art, Rahman questions myths, folk tales and widely spread prejudice that are still shaping our cultures and legitimating violence, adopting a contemporary and feminist lense. We met with her to discuss her recent work, Behula These Days where she brings together ancient crafts and new techniques to share the poignant and heart-wrenching experiences of women living in one of the most floodprone areas in Bangladesh.
Over the span of several months, students from GOBELINS Paris scouted La Défense, examining the iconic business district from the fresh perspective of urban metabolism. As part of a documentary workshop led by Pierre-Jérôme Jehel and Laetitia Guillemin (GOBELINS) and designed in partnership with researchers from the City-Metabolism Chair at PSL University, some thirty students explored this territory. They did so by treating it not as a mere backdrop but as a living organism, traversed by flows, tensions, and rhythms, using photography as a tool for revelation. Their projects, located at the crossroads of artistic creation and research, unveil an alternative reading of this mineral space, between invisible flows and underlying tensions. Both sensitive and rigorous, this inquiry is chronicled here by Corinne Feïss Jehel (EPHE-PSL), Pierre-Jérôme Jehel, and Émilie d’Orgeix (EPHE-PSL) as part of a research project conducted by the City-Metabolism Chair (which is financially supported by PCA-STREAM, Artelia, and Groupama Immobilier).
Read our discussion on the subject of generative AI with Raphaël Doan, a specialist in the sciences of Antiquity and author of the uchronia Si Rome n’avait pas chuté (If Rome hadn’t fallen), an essay imagining, with the help of AI, what might have happened if the Industrial Revolution had taken place under the Roman Empire. Through this experiment, fascinating possibilities for historical and archaeological research are outlined, as AI facilitates the processing of archives, the translation of lost languages and the deciphering of burnt texts.
In urban planning and geography, the concept of metabolism is frequently discussed. This organicist metaphor likens a territory to a body, traversed by flows of materials and energy that link it to its environment. From a quantitative perspective, these flows can be measured over time and space to assess what a territory consumes, processes, and produces. However, a qualitative approach is equally crucial, examining the political and social trade-offs that shape urban metabolisms. With this in mind, we spoke with two researchers, Clément Dillenseger and Pierre Desvaux, who have explored the waste sector to analyze the socio-technical infrastructures that underpin metabolism and the imaginaries that shape its perception.