They also remind me of inflatable concrete buildings. Most use an inflatable dome as a mold, and then are spray coated with concrete and reinforced. https://b

They also remind me of inflatable concrete buildings. Most use an inflatable dome as a mold, and then are spray coated with concrete and reinforced. https://baptistedarboistexier.wordpress.com/2015/09/06/bubble-houses/ https://baptistedarboistexier.wordpress.com/2015/09/06/bubbl... https://www.architectural-review.com/essays/craft/skill-inflatable-concrete-domes https://www.architectural-review.com/essays/craft/skill-infl... My favorite utilitarian version is Concrete Canvas, which makes pre-impregnated concrete fabric shelters. You open the pallet, inflate, spray with water, and then give them 24 hours to cure. The finished structure is sterile, fire resistant, can be buried, and has good insulating properties. https://www.concretecanvas.com/us/cc-shelters/ https://www.concretecanvas.com/us/cc-shelters/