In reference to the seen, there will be only the seen.
In reference to the heard, only the heard.
In reference to the sensed, only the sensed.
In reference to the cognized, only the cognized.
— Bāhiya Sutta (Udāna 1.10), translated by Thanissaro Bhikkhu
Nothing added, nothing pushed away. When a sound arrives, note it lightly: hear. Not the car or the voice, just the act of hearing, acknowledged and let go as the next sound comes. With eyes open or closed, see. Light, darkness, colour, shape. Then the body — the contact where you are held up, the hands, the breath. Feel.
Then turn inward and find the same three. A felt sense in the chest, an emotion hard to name: feel in. Rest attention where thoughts seem to happen and wait, as if in the cinema of the mind. A picture of dinner arrives. A voice says you have to cook something. See in, hear in. If you get caught up, replay the last moment. Was it an image, a sound, or a feeling that drew you in?
Is there anything you know that did not come through the senses?
Just seeing, hearing, and feeling, with no you in it. Then open your eyes, and keep looking this way.