Dos as in 2... this picture is based around that very concept. Although, it's not because of the two "subjects"... or the process which involved there generally being two of most objects... it's really because every base object is made of only *2* (yes, two) nodes. Basically the process was making 2 node objects and either cloning and mirroring or just overlaying to achieve the more "complex" objects (such as stars, lashes, etc).
This piece is very simple visually, but I don't think that's a bad thing (and it was a bit more time consuming to make than you might assume too). I'm actually quite fond of it. Yes, I know the crescent moon isn't accurate, but it looked much weirder with the stars missing from where the other part of the moon would be blocking them.
Done in Inkscape