There's DIY and there's a real DIY. The latter means, in our view, electronic circuits to design and etch circuit boards. The linked project triggered a fascinating way finally an issue in one plane and is therefore located in the sacred halls of the meta-DIY. In the air is too thin these Spheres know what might help it, a paint himself to mix, can be used to paint on tracks on Glastraegern. A dream for rapid prototyping, but apparently not toxic / not dangerous to manufacture. So rather hands off if you have not studied chemistry.