Here, materials and products capable of relatively complex behaviour due to the incorporation of nanocomputers and nanomachines. Also used for products having some ability to respond to the environment. If you combined microscopic motors, gears, levers, bearing, plates, sensors, power and communication cables, etc., with powerful microscopic computers, you have the makings of a new class of materials: "smart materials." Programmable smart materials could shape-shift into just about any desired object. A house made of smart materials would be quite useful and interesting. Imagine a wall changing colour at your command, or making a window where their was none before.