4D Printing : MIT's New Toy

Remember those tiny sponges that expand when exposed to water?  Well, this concept is used in the new idea from MIT, which they call it “4-D printing”.  This printer creates strands that can be molded into anything you want to.  When these strands are exposed to water, the strands can be folded into various shapes based on the placement of the materials.  It can also be folded into other shapes, not just the desired one. The creator and director of MIT’s Self-Assembly Lab, Skylar Tibbets, said that this can be used in architecture and other fields.  Wouldn't it be nice to see a building itself?