I just saw one. Great work Lyrics. Yes!!!! lots of energy. : )
...and, here's a link for rubys since you won't find it in Wikipedia.
Reference.com/Encyclopedia/Rubylith
I created topographical maps using 13 layers of rubylithe for several years until I convinced the company I worked for that I could do them digitally. It took 3 weeks to create a map using ruby and only 3 days on the computer.