Imagine a building that grows, breathes, and heals itself—no concrete, no steel, just living, breathing walls. Sounds like science fiction, right? But it’s happening right now. At the 2025 Venice Architecture Biennale, the Canada Pavilion is showcasing Picoplanktonics, a groundbreaking installation where the walls are alive. Literally. These 3D-printed structures are embedded with cyanobacteria, tiny organisms that require precise light, humidity, and temperature to thrive. If they die, the entire installation fails. And this is the part most people miss: it’s not just art—it’s a bold experiment in regenerative architecture that could redefine how we build.
But here’s where it gets controversial: while the installation is a marvel, it’s also a delicate ecosystem. Caretakers must monitor it daily for nine months, raising questions about scalability and practicality. Meanwhile, in a lab far removed from the Biennale’s grandeur, researchers have been studying similar cyanobacteria embedded in hydrogel for over 400 days. Their findings, published in Nature Communications, reveal a dual carbon sequestration process that’s both fascinating and frustratingly slow. These organisms don’t just survive—they transform their environment, precipitating calcium carbonate that could strengthen the material over time. But is this enough to make a real impact on climate change?
The study highlights two ways these living materials capture carbon. First, the cyanobacteria multiply and convert CO₂ into organic compounds through photosynthesis. Second, they create conditions that cause calcium and magnesium ions to form insoluble carbonates. Over 400 days, the material sequestered 26 ± 7 milligrams of CO₂ per gram of hydrogel—impressive in a lab, but what about in the real world? The hydrogel, made with Pluronic F-127 and urethane methacrylate, is 3D-printable and structurally stable, yet it transmits less light once the bacteria are encapsulated. Calcium staining shows the material gradually strengthens as minerals accumulate, but control samples without bacteria remain unchanged. This suggests the living material isn’t just capturing carbon—it’s becoming tougher over time.
Picoplanktonics isn’t just a display; it’s the largest known architectural structure made of living materials, developed by the Living Room Collective over four years. The team, led by Canadian architect Andrea Shin Ling, aims to shift from extractive production models to designs inspired by natural systems. But the installation also tests the limits of this technology. Can living materials survive—and thrive—at architectural scale for months, not just days? And if they can, what does this mean for the future of construction?
Here’s the catch: while lab data shows promise, scaling this technology to combat climate change is a monumental challenge. A metric ton of hydrogel would capture just 2.2 kilograms of CO₂ per month under ideal conditions. To make a dent in atmospheric carbon, we’d need volumes far beyond current capabilities. Plus, biological carbon sequestration is slower than industrial methods, though it requires no external energy and produces no toxins. This contrasts sharply with other bio-based approaches, like ureolytic MICP, which is faster but environmentally problematic due to ammonia production.
The bigger question remains unanswered: how will these materials perform over decades, not just months? Biomass accumulation plateaus after 25 days, hinting at a steady state between growth and decay. Could periodic maintenance or redesign extend their lifespan? And while the mineral phase reinforces the material, can we predict its behavior over time? These are the mysteries researchers are still unraveling.
So, what do you think? Is this the future of sustainable architecture, or a fascinating experiment with limited real-world application? Could living buildings one day replace concrete jungles, or are we asking too much of tiny organisms? Let’s debate—the comments are open.
