Had an extreme out-of-body experience while under the influence of strong salvia divinorum extract. the world and everything was torn away in cycles like layers of reality peeling away. As the reality peeled away it was like a curtain dropping and I had the strongest feeling that all of our reality and universe is an alien construct and we (and our entire dimension) are under constant observation. After 15 minutes of being cycled and torn horrifically around another dimension i saw myself sitting in my shed and I percieved myself gradually reentering my own head from the back, hallucinationg still, until i was seeing from my own eyes again. Just to make the point that certain substances can cause an out-of-body experience.