when I came home this morning (had some speed many hours before, a few beers and copious amounts of ganja) I decided to create some personal evidence on this topic.
I've been doing some K (and MXE) in my life but never pushed it to the limits.
I have no idea how much I took as I started with increasing bumps. eyeballed the last ones when already royally fucked but the total dose was
probably between 100-150mg (snorted).
as a conclusion I have to say: there is a unique, intriguing and very intense qualitative shift in the effects of ketamine, resembling only DMT in intensity and strength. in some ways even exceeding it.
I was lying on my back in my bed, no music, no lights, naked.
the first "new effect" was a very strong sensation of shifting proportions (sensation of being very small, of hands being huge, of my my brain shrinking in my head. stuff like that..), then the familiar mandala and flying through space imagery turned more and more into "the light". this state already reached DMT-like intensity with the only possible actions being breathing while sighing in awe and bliss.
but the real qualitative shift was yet to come: when the out of body state hit me I was severely shocked for a short time and snapped out of it several times. when I let go the experience was completely immersive und novel. there is just no physical body anymore. no breathing, no heartbeat, just consciousness. free floating in space. it feels and looks like (accompanying visual activity is very impressive) consciousness is folding itself into itself into itself, finally reaching the core, the essence. the state feels very holy and special.
the state (and following afterglow) allows you to juggle mental concepts, emotions, (contradicting) perspectives in a "meta" way. resembling constellation work in systemic therapy but able to fully immerse into the different personas/perspecitves. on the way down I called a close friend via headphones (sensation of him actually sitting in my head) and it allowed my to analyze shared problems with relationships, drug (ab)use, spirituality, life in general and our outlook as soon-to-be psychologists between aspirations and doubts (fueled by neurotic patterns) in specific...iirc he caught a severe contact high. :D
the whole experience was very, very lucid and analytical, I was fully conscious of my state (like: "I'm on K. it took a lot of it. this must be the hole they were arguing about in bluelight..."), I remember most and not only in a semantic way but concrete in form and content and in chronological order...dose was obviously on the edge of "the hole" (or whatever you may call it. does absolutely not matter imo.) as I could voluntarily snap out of it - always thinking "oh no, don't waste any second of this state!" :D
I guess I discovered a new perspective on and respect for ketamine. I guess once you've felt it's true power it's just not the same anymore...it is not a toy to play around with.
I slept a few hours and was/am still impressed enough to write this report. hope I could provide a few insights for other keta-apprentices...
edit; just remembered: when full effects kicked in I felt a deep urge to constantly mumble "reinigung, reinigung, reinigung..." which roughly translates to "purification", "cleansing" sensu analytical psychology.
http://en.wikipedia.org/wiki/Albedo_(alchemy) pretty much reflects the current state of my psyche. impressive. (please excuse psychobabble...

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