gibran2 said:Imagine you’re reading a novel and you’re so absorbed by the story and in tune with the main character that, for a moment at least, you forget who you really are and in effect “become” the character.
Imagine the character is a DMT user, and has particularly clear and expressible DMT experiences, filled with realistic and utterly convincing visions of hyperspace.
We can now ask the original question: Are the character’s DMT visions and experiences created internally, in the character’s brain, or externally in the physical reality of the character? It should be clear that the answer is neither, since the character himself/herself DOES NOT EXIST as an independent living being. The character isn’t real. The character was never born, will never die, and will never visit our space or hyperspace. The experiences and emotions we attribute to the character are in fact experiences and emotions had by the reader.
Surely the character"s experiences were created by the person who wrote the novel. Maybe this character has never visited hyperspace but is a projection of the writer"s direct experiences. Whether they be internal, external, inside out or any number of other things that haven"t even been thought of yet. Which, in turn, get shared by the reader.
gibran2 said:If there is no “you”, then there is no “internal” and there is no “external”.
As a final step in this little analogy, imagine that there is no reader.
If you imagine that there is no reader, do you imagine that there is no writer aswell?
If there was an "i don"t know" button i would probably press that.

Anyway, Aldous Huxley talked about the function of consciousness being a filter that limits awareness. Hyperspace is all around, but in order to keep an eye out for saver-tooth tigers, our reality is muchly limited. See also HP Lovecraft's from beyond.