A few/several weeks ago I saw Anthony Jones (correction: oops, it was Anthony Jones, not Andrew) post symmetrical robot head figures built up from simple scribble silhouettes (sorry I can't remember the link at the moment, I'll add it later if I can find it). I thought it'd be fun to draw like that and so I tried my own robot head thing. It's really just practice with value and planes. I'd probably like to polish this up some more, it's a fairly fun project.
I accidentally inversed the image when I was saving it, and I thought the inverse looked pretty cool, somewhat x-ray.