Wonderful thread, and I've experienced the group 'oneness' a couple of times, but it also brought back a moment of pure tranquility I experienced about 12 years ago. I was driving around the coastline near St. Johns Newfoundland, and I stopped to enjoy the sight and sound of the waves on a rocky beach in a secluded cove. As I was preparing to leave, I noticed a worn path leading up over a cliffside meadow, so I followed it for a couple hundred yards to where it ran along the edge of a cliff, with the coastline and the beach now a hundred feet below.
The moment was compelling, and I took out a harmonica (always travel with an instrument), sat with my feet over the edge, and started to play. I almost played myself into a trance with the music flowing, the sound of the surf, the wind in my hair, and the solitude.. A half hour passed before I was aware of anything else, and with regret (and a strong feeling of inner peace) I went back to the car and headed back into the 'other' world.