3D pen from Creopop. Ultraviolet light hardens cool-to-the-touch "ink" as you "draw". This is the same technology that dentists are using to "cure" modern dental work. The refills have to be kept out the light, or they will harden and become useless. Fun use of this technology, although the freehand nature of the device requires a steady hand to avoid sloppy-looking sculptures Click image for more photos.