A 3D sculpting pen
The American company WobbleWorks has developed a pen, the 3Doodler, which allows you to draw in three dimensions! In fact, the 3Doodler enables you to print your drawing in real-time without the high costs of a 3D-printer. Additionally, software is not needed; simply plug the pen in an electrical socket. The pen uses a similar type of plastic also used by most 3D printers. WobbleWorks recently started a campaign on Kickstarter.
Read more about the 3Doodler on Colossal.