Snyder:
"My idea for the codex was that the skull was sort of the first Kryptonian they could identify in their evolution as -- they wouldn't call them homo-sapiens, but whatever the Kryptonian version of homo-sapiens is. They traced their lineage back and they found this skull; and this was the first sort of physical incarnation of what a Kryptonian -- an ideal Kryptonian would be. So, that's sort of the raw material for the DNA: the DNA you see in the codex being extracted from it.
We always imagined that was sort of the raw material, and then each individual -- as the raw material came out, each and every individual sort of -- the little subtle differences, whether you were going to make a warrior or a scientist or whatever they were constructing in the genesis chamber, those things were then changed as the stream came out of that skull. And then I also -- we were saying that the way it was engraved was because
it was a while that skull had been fought over and different factions of -- whether it be religious or scientific had warded over the skull and many people had died; and so some culty monk group had carved the different Kryptonian sayings into the skull.
And then finally when it was wrestled away by whatever factions who created the genesis chamber and the sort of -- the construction of Kryptonian society as we see it now -- they were able to get it to the genesis chamber and start to create. And I would say that there was probably -- in the other genesis chambers across Krypton, there might be a femur or a little chip -- you don't get the whole skull. In the capital there, you're going to have a pretty important piece of that skeleton and maybe in other cities you get smaller ones."
