This is actually based on one of the first ever sketches I did for the digits back in... uh.... not that long ago, relatively? I guess sometime in March or April of 2012. I remember drawing it in one of my classes, but I think most of the relevant concept sketches I did for Metacarpolis were done just a few months before I started putting out the comic. Despite the fact that the first concept sketches were done in, like, 2008 or 2009.
I have those sketches, readers.