Well, it's actually bolted on, in my version. They are metal cutouts of the #'s, and then machine bolted on. This thing is an experiment, so I'm assuming it was sedated at some point for tests and what not. But yes, I was going to do this laser-carved in look in zBrush, but totally forgot, and once I started rendering, it was pointless to go back in and sculpt it, so I did it in post.