
It is an illustration from Thing Two's favorite children's book when she was small - Goodnight Moon. Framed by the window is the moon and an Apollo CSM. On the CSM are the roman numerals IX XI. All of these things have meaning somehow or another, but here's the general breakdown of this one.
Thing Two loves Goodnight Moon. This is HER tattoo. Also, the IX XI on the CSM are her birthdate.
El Jefe and Thing One are Space Geeks. They are fascinated by the space race, and you often see either (or both) of them watching the science channel's many space shows. Space week was like a holiday here. I promised El Jefe long, long ago that I would never have his name or likeness tattooed. And I will keep my word. But he is my command module, unable to do anything, but keeping a close eye on me at all times and dispensing careful advice. And now I have that analogy forever with me.