This story was inspired by the Live Science article "This yeast-based 3D-printed biomaterial could one day replace your wallpaper and drapes." Chalmers University of Technology developed a room-temperature 3D-printable building material from baker's yeast, cellulose fibers, and algae-derived gel. In the story, an engineer and his robot repair walls in a remote highland village using only local yeast, straw, and pond algae—shipping nothing. If the most sustainable building material is the one that doesn't need to be transported, is progress about bringing things from far away, or about noticing what's already at our feet?