I found myself projected against an obstacle which I could not penetrate. It was like the others, yet incalculably denser; a sticky clammy mass, if such terms can be applied to analogous qualities in a non-material sphere.
I had, I felt, been halted by a barrier which my friend and leader had successfully passed. Struggling anew, I came to the end of the drug-dream...
Fiction - Hypnos (1922)