Researchers from the University of Illinois created a ballpoint pen, where used silver instead of the usual ink. It lets you draw circuit diagrams on plain paper, wood or any other surface.The main advantage of such pen is the possibility of replacing expensive printers with more cheaper instrument for the letter. With the help pen kids can create a primitive paper LED-display. In the future, they plan to expand the color pallet and the ion-conducting materials.This technology has attracted not only engineers’ attention , and also the creative people. Chinese painter ung Hee Kim already painted the picture using this pen.