Conductive silver pens have been around for ages, but this Circuit Scribe project, they claim it’s easier to draw with, and they made magnetised components to go with it. So you can draw a circuit and stick components onto the traces magnetically. Seems like a good idea for teaching kids the principles of basic electronics. Also maybe you could make your own magnetic components, or just stick them on there some other way. And then make pretty pictures that have sound and flashing lights. Good for an exhibition at the Audio Foundation?