That was when I found it. Before it... intersected with the "real" world. Before it "laid over" it.
[Like two spheres, bumping into each other, and the Upside Down is the area where they intersect. That's how he inherently understands it, even if he cannot scientifically explain it. plus it's not like canon explains it]
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[Like two spheres, bumping into each other, and the Upside Down is the area where they intersect. That's how he inherently understands it, even if he cannot scientifically explain it.
plus it's not like canon explains it]They were coming into mine.