Osho talks about Whirling:
"Whirling is one of the most ancient techniques, one of the most forceful. It is so deep that even a single experience can make you totally different. Whirl with open eyes, just like small children go on twirling, as if your inner being has become a center and your whole body has become a wheel, moving, a potter’s wheel, moving. You are in the center, but the whole body is moving." Osho
"This whirling, Sufi whirling, is one of the most ancient techniques, one of the most forceful. It is so deep that even a single experience can make you totally different. You have to whirl with open eyes, just like small children go on twirling, as if your inner being has become a center and your whole body has become like a wheel, moving- a potter′s wheel, moving. You are in the center, but the whole body is moving. Start slowly, clockwise. If somebody feels it is very difficult to move clockwise then anti-clockwise, but the rule is to move clockwise. If a few people are left-handed then they may feel it difficult; they can move anti-clockwise. And almost ten percent of people are left-handed, so if you find that clockwise you feel uneasy, move anti-clockwise; but start with clockwise, then feel. Music will be there, slow, just to help you. In the beginning move very slowly; don′t go fast, but very slowly, enjoying. And then, by and by, go faster. The first fifteen minutes, go slowly; the second fifteen minutes, fast; the third fifteen minutes, faster; the fourth fifteen minutes, just completely mad. And then your total energy, you, become a whirlpool, an energy whirlpool, lost completely in it: no witnessing, no effort to observe. Don′t try to see; be the whirlpool, be the whirling. One hour.
"In the beginning you may not be able to stand so long, but remember one thing, don′t stop by yourself, don′t stop the whirling. If you feel it is impossible the body will fall down automatically, but don′t you stop. If you fall down in the middle of the hour there is no problem; the process is complete. But don′t play tricks with yourself, don′t deceive; don′t think that now you are tired so it is better to stop. No, don′t make it a decision on your part. If you are tired, how can you go on? You will fall automatically. So don′t stop yourself; let the whirling itself come to a point where you fall down. When you fall down, fall down on your stomach; and it will be good if your stomach is in direct touch with the earth. Then close the eyes. Lie down on the earth as if lying down on the breast of your mother, a small child lying down on the breast of the mother. Become completely unconscious. And this whirling will help.
"Whirling gives intoxication to the body. It is a chemical thing, it gives you intoxication, to be exact. That′s why sometimes you may feel giddy just like a drunkard. What is happening to the drunkard? Hidden behind your ears is a sixth sense, the sense of balance. When you take any drink, any alcoholic thing, any intoxicating drug, it goes directly to the center of balance in the ear and disturbs it. That′s why a drunkard cannot walk, feels dizzy. The same happens in whirling. If you whirl, really, the effect will be the same: you will feel intoxicated, drunk. But enjoy this drunkenness is worth something. This being in a drunken state is what Sufis have been calling ecstasy, masti. In the beginning you may feel giddy, in the beginning sometimes you may feel nausea, but within two, three days, these feelings will disappear and by the fourth day you will feel a new energy in you that you have never known before. Then giddiness will disappear, and just a smooth feeling of drunkenness will be there. So don′t try to be alert about what is happening. Let it happen and become one with the happening.
"In the morning, alert; in the afternoon, half alert, half unalert; in the night, completely unalert. The circle is complete.
"And then fall down on the ground on your stomach. If anybody feels any sort of pain in the navel center lying down on the ground, then he can turn on the back, otherwise not. If you feel something, a very deep painful sensation in the stomach, then turn on your back, otherwise not. The navel in contact with the earth will give you such a blissful feeling – just the same as once you had, but now you have forgotten, when you were a child lying down on your mother′s breast, completely unaware of any worry, any anxiety, so one with the mother, your heart beating with her heart, your breath in tune with her breath. The same will happen with the earth because earth is the mother. That′s why Hindus have been calling earth the mother and sky the father. Be rooted in it. Feel a merger as if you have dissolved. The body has become one with the earth; the form is there no more. Only earth exists; you are not there. This is what I mean when I say break the cup completely: forget that you are. The earth is, and dissolve in it.
"During the one hour of whirling the music will continue. Many will fall before the hour but everybody has to fall by the time the music stops. So if you feel that you are still not in the state of falling then go faster and faster. After forty-five minutes go completely mad, so by the time the hour is complete you have fallen. And the feeling if falling is beautiful, so don′t manipulate it. Fall, and when you have fallen then turn on your stomach, be merged, close your eyes. This merger has to be there for one hour. "
Osho, A Bird on the Wing, Chapter #1