Grant Morrison said that Limbo is the last outpost of DCU proper, beyond it are the archetypal Monitor World and Overvoid
Morriso: Limbo is what's been erased, isn't it? It's literally the characters that are almost forgotten. Almost whited-out. It's the characters that have been dumped from the continuity for one reason or another. When I visited the idea in Animal Man back in the eighties, most of those characters were forgotten sixties characters. But now, the place is populated by these nineties Blood Pack and Hero Hotline guys! I've just always loved it as a concept. In the case of Superman Beyond, which was like a Yellow Submarine, Jason of the Argonauts tale, I wanted to take my super-Argonauts to that place at the very edge of art where all these forgotten ideas live.
The last outpost of the DCU proper before the archetypal Monitor World and the Overvoid.
The Monitors are primal forms in a fundamental world. It's very likely that he's saying that the Monitors are Platonic Ideals/Forms
In GM's book Pop Magic, GM said that gods are primal forms that represents Platonic Ideals or archetypal human experience. I doubt that GM just randomly used the word primal form when he has used it before to refer to Platonic Ideals
assumption of godforms—where with "concentrated imagination of oneself in the symbolic shape of any God, one should be able to identify oneself with the idea which [the god] represents." Comics writer and practicing magician Grant Morrison describes the process in his essay
Pop Magic. The Gods of myth are primal forms, expressions of big ideas that have been here long before us and will remain long after.Morrison writes that, for example;
ANGER is one of those Big Ideas and LOVE is another one. Then there's FEAR and GUILT
So…to summon a god, one has only to concentrate on that god to the exclusion of all other thought. Let's just say you wish to summon the Big Idea COMMUNICATION in the form of the god Hermes, so that he will grant you a silver-tongue. Hermes is the Greek personification of quick wit, art, and spelling and the qualities he represents were embodied by Classical artists in the symbol of an eternally swift and naked youth, fledged with tiny wings and dressed only in streamers of air. Hermes is a condensation into pictorial form ― a sigil, in fact ― of an easily recognizable default state of human consciousness. When our words and minds are nimble,when we conjure laughter from others, when we make poetry, we are in the real presence of Hermes. We are, in fact, possessed by the god.
Morrison is keen to point out that there need not be a ghostly or real reason for this. As Crowley wrote: In this book it is spoken of the Sephiroth and the Paths; of Spirits and Conjurations; of Gods, Spheres, Planes, and many other things which may or may not exist. It is immaterial whether these exist or not. By doing certain things certain results will follow; students are most earnestly warned against attributing objective reality or philosophic validity to any of them.
People tend to become possessed by gods arbitrarily because they do not recognize them as such; a man can be overwhelmed with anger (the Greek god Ares), we can all be "beside ourselves" with passion (Aphrodite) or grief (Hades). in life we encounter these Big Ideas everyday but we no longer use the word "god" to describe them. The magician consciously evokes these states and renames them gods in order to separate them from his or her Self, in order to study them and learn.
So for example, "You may wish to connect with Hermes if you're beginning a novel or giving a speech or simply want to entertain a new beau with your incredible repartee". Practical magic then. Choose a god based on their qualities; what Platonic ideal or archetypal human experience they represent, and invoke them in order to know and learn from them. But again, a question arises. If these archetypal forms 'work' i.e. have effects, but they are not real, then why work with the old gods at all? Why not draw on modern myths.?
GM: Maybe Metron is a little more literal and specific an image, but he's kind of like an angel ― an angel of electricity and writing and inspiration like all of those messenger/writer gods I mentioned above. So I see him as the headman, the Platonic form, behind guys like the Flash and all the electric-based heroes in the DC Universe"