>>79947502The Source is multiple things. Kirby created it as the secrets of life and the universe, the answers to all things, the Life Equation. Morrison and others today have it as a metaphor for reality, where the readers and creators exist. The recent GL event Lights Out said that all of the emotional energy in the universe comes from there, which would be a good way of saying that the DCU is literally fueled by the emotions of the readers and writers, but of course Venditti fucked it up because he's a hack.
This would also be the location of the Bleed/Ultramenstruum that separates fiction from reality.
The Sourcewall itself is the fourth-wall we look through to see the stories. It's represented in the comics by a huge physical wall "around" the universe. Touching this wall is the equivalent of "flying too close to the sun" or trying to eat the forbidden fruit of the tree of knowledge.
So crossing the Sourcewall can be seen as learning the nature of the universe, whether in an actual sense in communing with God, or in the metaphorical sense of being aware you are in a fiction. So this is what Morrison inteprets the Life Equation as; being fully aware of being a comic character and having crossed to the other side, communed with your creator and returned to your universe with ultimate knowledge of why things are.
Morrison first dabbled with this concept in Animal Man when he had Buddy meet him in his house, then in the 90's he tried several experiments in writing and magic sigils to actually bring a fictional character to life in the real world or contact that world, and most recently Ultra Comics in Multiversity was his attempt to bridge the gap between worlds by creating a "superhero" equivalent in ours.
