If you didn't grow up surrounded by capacitative touch user interfaces, it's likely you may have one of these around your house as a kid: The magic Etch-A-Sketch screen. 

In today's "Presentation of the Day" artist Andrea Tilden (at PKN Waterville, Maine Vol. 3) goes into aluminum-particle levels of detail on how she goes about creating and preserving her unique works. Whether you're a Master Etcher, or only skilled enough to etch out stairs or angular castles, this presentation is worth a glance.