The future of architecture is alive and breathing, quite literally. Scientists and architects have teamed up to create a revolutionary building material that challenges our traditional notions of construction. This innovative material, showcased at the Canada Pavilion in Venice, is not just a static element but a living, growing entity with the ability to heal itself.
A Living Experiment in Venice
The Picoplanktonics installation at the Venice Architecture Biennale in 2025 was more than just an architectural display; it was a living, breathing experiment. The structures, designed and developed over four years by the Living Room Collective, were embedded with a secret ingredient - cyanobacteria. These tiny organisms transformed the installation into a dynamic, ever-changing entity, dependent on precise environmental conditions for their survival.
What makes this project particularly fascinating is the interplay between biology and design. The architecture failed if the microbes did, creating a symbiotic relationship where the success of one relied on the other. This concept of 'living architecture' is a bold step towards sustainable and regenerative design practices.
Unveiling the Secret of the Pavilion Walls
At first glance, Picoplanktonics appeared as a futuristic, speculative design. But beneath its aesthetic appeal lay a deeper purpose. The installation was a test site, an exhibition, and a showcase of what living materials could achieve in the field of architecture. The printed components, designed to host microorganisms, served as a platform for carbon sequestration, a crucial aspect of combating climate change.
The timing of the public installation coincided with a significant scientific breakthrough. Researchers, led by Mark W. Tibbitt and his team at ETH Zurich, published a paper in Nature Communications, revealing their photosynthetic living materials' ability to capture carbon for over a year. This overlap between art and science brought the potential of these materials to life, showcasing their architectural possibilities while measuring their environmental impact.
The Science Behind the Living Material
The secret to this living material lies in the cyanobacterium Synechococcus sp. PCC 7002, encapsulated within a printable hydrogel. The goal was not just to keep the organism alive but to harness its biological processes for useful work over time. During a 30-day incubation period, the printed samples became greener as the cells multiplied, forming mineral deposits throughout the hydrogel.
This process resulted in two types of mass accumulation. Firstly, straightforward biological growth, where the cyanobacteria converted CO₂ into biomass through photosynthesis. Secondly, and more significantly, microbially induced carbonate precipitation (MICP) occurred, where the microbes created alkaline conditions, causing dissolved ions to form solid carbonates. This second pathway led to a more durable result, with the living material sequestering carbon for an extended period.
The Role of Shape and Geometry
The material's design had to strike a delicate balance. A dense scaffold could provide structural support but might hinder the light and nutrient flow essential for the cells' survival. To overcome this challenge, researchers used F127-BUM, a photo-cross-linkable hydrogel system, which allowed for additive manufacturing while transmitting usable light.
The geometry of the material played a crucial role in its performance. A flat block was not the most efficient design. The team found that textured and lattice-like structures improved light exposure, with one coral-inspired surface increasing the printed gel volume while maintaining bacterial viability. This design logic translated into the pavilion's structures, which were not mere decorative elements but functional components, providing the necessary space, light, and exchange for the living matter to thrive.
The Potential and Limitations of Photosynthetic Living Materials
The appeal of these photosynthetic living materials lies in their ability to work under ambient conditions, utilizing sunlight and atmospheric carbon dioxide. They do not require toxic feedstocks, making them a sustainable alternative to industrial carbon-capture systems. However, their biological nature means they are slower than many industrial processes.
What's intriguing is the potential for these materials to mechanically reinforce structures over time as carbonate minerals accumulate. This raises the possibility of self-healing, self-reinforcing buildings that become harder as they age, a concept that challenges our traditional understanding of construction.
A Step Towards a Living Future
Picoplanktonics and the research paper published in Nature Communications demonstrate the potential of living materials in architecture. While a city built entirely from these materials may still be a distant dream, these projects showcase the feasibility of hosting living experiments at a room scale. They bring laboratory results into the realm of architectural possibilities, opening up a world of opportunities for sustainable and regenerative design.
In my opinion, this fusion of science and architecture is a glimpse into a future where our buildings are not just passive structures but active participants in the environment, contributing to a more sustainable and resilient world.
