Designing for the Leaky Body

Leaking bodies are often concealed or disregarded in both society and design. Likewise, bodily fluids are rarely leveraged as triggers for material interaction in HCI. In this pictorial, we investigate how fluid-responsive biomaterials can enable porous, expressive, and cyclical interactions co-shaped by the body. We focus on a milk-derived bioplastic with reversible shape-changing properties, examining fluid absorption as a meaningful design affordance. Our material-led approach contributes both formulation and fabrication methods of casein bioplastic; while autoethnographic inquiry with a lactating body informed the development of Leaky Body Maps and speculative garments that position leakage as a generative site of body-material interaction. This work contributes to the discourse of feminist and posthuman HCI by centering bodily permeability, material responsiveness, and the potential of designing with – rather than concealing – leaky bodies.