Watch this video presentation about 3D printing. 3D printing is disruptive technology that is going to radically change the way things are made, bought, and sold:
http://www.wimp.com/printingchange/
How about inflatable concrete structures that you wet, set, and inflate?
http://www.wimp.com/concretetent/
http://www.wimp.com/printingchange/
How about inflatable concrete structures that you wet, set, and inflate?
http://www.wimp.com/concretetent/