Biocalcification is a naturally occurring mineralisation phenomenon resulting from the urease produced by microorganisms inhabiting soil environments. This process, often referred to as microbially induced calcite precipitation (MICP), is primarily exploited in an engineering context for soil stabilisation and the repair of concrete structures. MICP represents an emerging area of research in architecture and design. In this paper, we discuss the appropriation of MICP on Papier Plume, a foam made of paper waste used in the context of ImpressioVivo: a design-led research project exploring the conception and fabrication of 3D-printed and bacterially induced bio-sourced materials for a circular design framework. In the light of a previous study based on two strategies of calcification: (1) direct inoculation (2) spraying, we – a team of two designers and a microbiologist – discuss the relevance of an immersion strategy applied to the dry paper foam substrate. By doing so, we reflect on the relevance of MICP as a material design process underpinned by sustainable and circularity concerns, from a design perspective, but also into an attempt to embrace the perspective of the bacteria supporting these experiments; namely Sporosarcina pasteurii.

Local recirculation of materials is a key aspect for a green transition, as it enables materials to be reused in new life cycles locally. In this article, we use the material “paper” as a case study to explore how this material recirculates at the local scales. This article aims at observing and evaluating upcycling scenarios as part of an expansion of local end-of-life possibilities compared to the current situation where paper end-of-life is reduced to a few recycling plants in France and abroad. This work relies on interviews and questionnaires that aim at understanding how paper is used and explored by artists to be recirculated in products. Indicators were tested to provide a methodology to compare different material circulation scenarios in terms of material use, environmental impact and value perception. Collaboration among multiple actors, artists, community centres, schools and industrial players is crucial for scaling up such recirculation loops.