There's plenty of 'pop-up' architecture out there, but that usually just means a building's in a spot temporarily, rather than physically popping up. This is a little different. Buenos Aires architects Matías Alter and Matías Carrizo have designed disaster relief housing that can be folded flat when it's not in use.
Most disaster housing arrives disassembled—so extra time and labor is needed to get it ready—or completely pre-built, so it takes up lots of space and requires cranes for installation. The architects' Modularflex modules avoid those problems; the homes can be put together in around a half an hour, and take up so little space that six or seven can be packed in a truck. Besides saving money, the flat-packed houses help save energy: with so many homes on one truck, much less fuel is needed to get them where they're needed in an emergency.
Images courtesy of 2M Architectos