I was thinking about that the other day, and relating back to how when you stare at something long enough (without the scene you're looking at changing or without you blinking) you'll notice it begin to "fade away". I'm thinking that once the fading away has completed, that's what the 3D Blackness is. It's the complete loss of visual stimuli. I think that's when you can effectively switch your visual input to another reality frame.
Oh is that what that is.. :p
I had that 2 nights ago.. it happened just like you say, as the visuals started to fade away.. the 3D blackness began. It's like a "gel" of nothingness and there holes, depressions, tunnels etc in the gel. Or another way I can explain my experience is like I am inside an "asteroid" from a sci-fi movie/book. It's not completely pitch black but there are smooth holes and tunnels cut into the rock that have been smoothed over time.
I tried to focus on the image of API at that time but then I got distracted by other stimulus within the blackness.
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