The third level of mediation is choice-less with no-thing to do. No object of your focus (as opposed to the nose in level 1 and the body in level 2). It is level 3 for a reason. It is hard to not have an object of focus and not have your mind take over with thoughts of past/present/future.
This is why you must first learn to sit your mind with the use of level 1 to form concentration and level 2 to de-program/condition with neutrality. Once de-conditioned and with strong neutrality, choice-less awareness is a little easier. Sit and be still.
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Sounds counter-intuitive and not nothing. You might have already been doing this but if not, it is a potential step you can take. You’ll be staring out at the back of your eye-lids or at least that is what you think. Now rest in choiceless awareness.
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Don’t search for something to see, nor give what you see attention. You are going for closed-eyed peripheral vision and you are resting in it with no force. The dude abides.
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You are going to be met with some interesting spacial experiences. Don’t get stuck wondering around so to speak. This is kinda like realizing you are in a dream and intending to progress forward upon the realization. Gently and subtly suggest progressing forward. The formless gates are a fickle business. Be patient, be choiceless and be neutral for as long as it takes, and then some.