When I was a young kid we used to spin ourselves around really fast, then someone would grab us from behind and squeeze us really hard while we held our breath. Just before we'd lose consciousness the world would flip and there was a moment when you didn't know which way was up or down. That was the last thing you remembered as you startled wide-eyed back awake, sucking in a huge breath and wondering, "What just happened, how did I get here, flat on your back looking up at the sky !?" Complete disorientation.
We were too young for drugs so it was as close as we could get to an encounter with the great beyond. Strange way to seek out the supernatural. Guess it was the best we could come up with at the time. But I loved the "not knowing" what was up or down, what am I doing here, what just happened to me??
I still love it when nature gives me the same opportunity for total dis-orientation. This morning I was staring off into space from a bridge in Rhode Island.
Click on the word vimeo in the lower right. Then on the arrows in the lower right > fullscreen. Stare at the middle of the picture and try figure out which way is up or down.