In yet another experiment to create an alternative to concrete, researchers have created "reversible concrete." Last year at the Chicago Architecture Biennial, Self-Assembly Lab at MIT and Gramazio Kohler Research of ETH Zurich unveiled a process that uses a 3D printing extruder, rocks, string, and smart design.

Though clever in theory, the question remains, can it live up to concrete's stability, strength, and permanence?

Read More