Bucky Fuller was right: the "dome" and other quasi-spherical structures are theoretically the lowest-cost way to enclose and shelter volume. But they need not be made of triangles, as Fuller preferred. Thin-shell concrete may be the ideal material, especially if the primary reinforcement is non-ferrous, carbon-fiber-epoxy grid, made for this purpose by Chomarat, as "C-Grid". We have built a proof-of-concept scale model in Juneau, Alaska, about 1 cm thick, and tested it for static and seismic load strength. We designed a compact, transportable, re-usable forming system kit, which allows building many low-cost structures in the same location. Closed-cell urethane foam thermal insulation would be sprayed onto the interior, if required. This video begins by reviewing thin-shell concrete construction in general.