Although concrete is a building material known for stability and strength, a new process might put its permanence to the test. Using a 3-D printing extruder, rocks, string, and smart design, a team of researchers has created an aesthetically pleasing 13-foot-tall column.

The rocks are bound together by the string into whatever shape is required, reports Green Building Elements' Dawn Killough. Dismantling is easy – just pull the string out.

One can only imagine the future uses for this type of material: buildings that can change shape based on occupancy needs, true “living structures;” roads and highways that heal themselves; and who knows what they will think of next.

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