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Grobund: Urban Benches That Double as Insect Hotels

Q: What is "Grobund: Urban Benches That Double as Insect Hotels" about?

This article covers topics related to Insect Hotel, Urban Design, Furniture Design. A modular seating system merges biophilic design with pollinator habitat, turning leftover city spaces into networked urban biotopes.

What if every park bench in a city was also a functioning ecosystem? Grobund answers that question with disarming simplicity: a modular bench that shelters solitary bees in bamboo inserts, attracts butterflies with flowering Phlox and Echinos, and houses ladybirds in organic nesting slots. The result is urban furniture that doesn't just occupy public space but actively regenerates it, turning residual patches of pavement into nodes of biodiversity.

Designed by Slava Ivanov and Marius Costan, Grobund received an Honorable Mention at the Urbanscape 2018 competition. The project reframes the conversation around urban furniture by fusing it with ecological infrastructure, proposing a scalable network of insect hotels and micro-biotopes that could thread through any city willing to treat pollinators as stakeholders in public space.

Three Layers, One Circular Module

Technical drawings showing plan, elevation, isometric and assembly views of circular modular units with perforated walls

Exploded diagram illustrating the layered construction of circular planting modules with perforated concrete walls and green roofs

The technical drawings and exploded diagrams reveal a clean tripartite logic. A perforated shell base, fabricated from lightweight recycled material, forms the outer enclosure. Its perforations are not decorative; they are calibrated entry points for insects, allowing passage into an inner layer of compartments filled with species-specific nesting materials like drilled wood and bamboo. The top layer switches between dual-purpose seating surfaces in durable beech wood and vegetation covers that support microhabitats for plants. This stacking sequence means every module can be configured as a seat, a planter, or a hybrid of both.

What makes this system genuinely useful rather than merely clever is its modularity. Individual units can stand alone or cluster together, forming larger biotopic assemblies that scale from a single street corner to an entire district corridor. The circular plan geometry keeps the footprint compact while maximizing the perimeter available for insect access, a small detail that speaks to how seriously the designers treated the non-human users of this furniture.

Low-Carbon Materials and Stormwater Logic

Grobund's material palette is deliberately restrained. Recycled content in the perforated shell keeps embodied carbon low, and the lightweight construction reduces emissions during transport and installation. Beech wood seating surfaces resist decay without chemical treatment, extending the lifespan of each unit. Integrated vegetation does more than provide habitat: planted modules intercept rainfall, slowing runoff and helping manage stormwater at the micro scale. In aggregate, a network of these benches acts as a distributed green infrastructure system, chipping away at the urban heat island effect one node at a time.

A Green Corridor Woven Between Buildings

Aerial rendering of a curved linear park threading between residential blocks with planted beds and pedestrian paths

The aerial rendering shows what Grobund looks like at the urban scale: a curved linear park threading between residential blocks, lined with planted beds and pedestrian paths. The modular units are no longer isolated objects; they become the connective tissue of a green corridor that links pockets of habitat across the neighborhood. Ivanov and Costan frame this as a move toward what they call "bio(divers)cities," an urban model in which small biotopes, connected through modular furniture, form ecological networks that enhance both biodiversity and human well-being.

The ambition here aligns with UN Sustainable Development Goals for climate action, responsible consumption, and life on land. But the rendering also communicates something less quantifiable: the simple pleasure of walking through a neighborhood where public seating is alive, where benches hum with pollinators and soften the hard edges of residential blocks with flowering plants. The corridor is not just infrastructure; it is an argument for a different quality of everyday urban life.

Why This Project Matters

Pollinator decline is one of those crises that feels abstract until you look at the numbers. Grobund makes it tangible by embedding the response into the most ordinary element of public space: a bench. The project does not ask cities to set aside new parkland or rezone districts; it asks them to upgrade the furniture they were going to install anyway. That pragmatism is its greatest strength. A modular unit that supports solitary bees, manages stormwater, and seats two people is not a utopian proposition. It is a procurement decision.

Ivanov and Costan demonstrate that ecological design does not require monumental gestures. It requires systemic thinking applied at the scale of everyday objects. Grobund turns benches into habitats, streets into corridors, and cities into ecosystems, one circular module at a time. For a competition entry, that is a remarkably actionable idea.