Posture: either sitting on a pillow placed on the floor, or sitting on a chair with a straight back. Leaning forward may invite the exchange of meditation with sleep and may also invite back pain.
Mouth: lips are closed, small gap (rice grain) between the upper and the lower teeth,
Tong: tong touching lightly the roof of the mouth while resting on the lower front teeth.
The tong is a “barometer of stress”, vacuum in the mouth, is a sign of tension.
The connecting point between the tong and the roof of the mouth is a center of concentration.
Eyes: preferably with eyes close, observing “black clouds”. Black-Clouds are the different patters we see, when we close our eyes, for a longer period of time.