First of all, dogmatic rationalists: Abandon all hope ye who enter.
Last night I had a peak experience, unique and intensely positive. I'll make no claims to a clear understanding, but I can tell you what I attempted, and how it seemed to succeed.
It was a rock show on New Years Eve, and my perspective was informed by booze, music, a wild crowd, dance and fine, cerebral nugs. There were no major hallucinogens present, but I am familiar with several, as well as some forms of satori. It was late in the second set, and I was visualizing the movement of energy in the crowd and doing a kind of dancing Tonglen, where you breathe in the impurities around you, refine them in your inner channels, and exhale brilliant light. This was after midnight, and the New Year had me thinking of the coming Timewave, which I don't entirely believe in, but kind of do.
In my effort to be a "battery" for the crowd, it occurred to me that if the Timewave is really out there, so near, then I ought to be able to locate and perhaps access it, so I cast my mind forward, probing along the lines of causality, and the experience was a sort of "Oh, I think I found...BLXZRST!!!" It was like I stuck my astral finger in a light socket. My mind was blown to maximum capacity, and the needle was rounding the dial. The peak surge brought a vividness like the moment of lucidity in a dream, illuminating space-time all around for an instant, and threatening to wash out particulars completely. There seemed to be a danger that I would be extracted entirely from linear time--maybe it was a fear of ego-loss that stopped me, which is disappointing to consider, but in any case, I pulled back, energized by the experience but unwilling to sustain it.
So that's it--the whole thing was almost involuntary, and it was only afterward that I realized what I'd done. Did I actually touch the Timewave, or did I just induce manic vision in my own mind? In any case, I've found a new practice for my immaterial toolbox, and I expect to explore it further.