Can we turn organic waste into a circular material, a material that allows us to grow objects at home? Catinca is bridging biotech and the social dilemmas. This design-science collaboration makes a social biotech proposition: to shift perception on H.O.W. from waste to a valuable renewable resource, one that people could use and benefit from. About 50 resulting samples of material obtained in different ways offer a first glimpse of what a participatory H.O.W. material could look like