Moulds are ephemeral works, which are based on the material Agar. Agar is a nutrient medium, used in biological labs, to cultivate microorganisms. I use baking yeast to print on the Agar. These silk-screen prints start to grow and become visible. More and more other microorganisms colonise the printed motifs, mostly different moulds or other yeasts. The main roles play the microorganic surrounding of the production space and the social surrounding, which the cultures could partly make visible. I present the living cultures in terrarium-like boxes. They have an inbuilt ventilation- and filtration- system, so no mould spores could contaminate the exhibition space. My attempts to conserve the cultures with resin often don’t work. It just brings up questions about the dichotomy of the fragility of living matter and the human habituation of stability.