Catriona is fascinated by the idea of the urban landscape as a collage. She is inspired by how over time architecture forms an urban geology where layers of history are built on top of foundations. Her work responds to the interconnectedness of nature and the city as a landscape resulting in sculptures that embody an architectural imprint. There is a subterranean network of hidden cities beneath us, organic intertwined with inorganic. By covering the ground in concrete, tar and bitumen, we are disrupting the ecological cycle as these inorganic materials degrade at different rates with little or no nutritional benefit to the earth. Her use of re-claimed and re-cycled materials reflect on our throw-away culture, where the bedrock beneath the future city will be made up of detritus and past human relics rapidly compressed to form a new transient sedimentary layer in deep time. Robertson imagines a post-human future which nature will come back through the cracks as the concrete breaks down and where gargantuan worm-like creatures have adapted to digest these synthetic materials.

Her sculptures burrow and bury themselves, digging into the ground and into the ceiling. Tunnelling through in-between spaces, they re-emerge with a new hardened stone-like shell. On the edge of collapse and precarity she performs a ritual of breakage in her process, pulping materials to their core fibres. By squeezing, cracking and blending these opposing elements into a collage, soft textiles start to ooze between the gaps in the facade, as if forming a synthetic marble from plasticised concrete.