New students at Tuni are frequently puzzled by the same pair of mudras, and reasonably so: Gyan Mudra and Chin Mudra are made with exactly the same fingers, touched together in exactly the same way — index fingertip to thumb tip, the other three fingers extended. Shown side by side without context, most people cannot tell them apart. And yet Guruji teaches one for the start of the day and pointedly withholds the other from anyone practising in the evening who is already struggling to sleep.
The entire difference is the direction the palms face. It sounds too small to matter. It is not.
Palms up, palms down
Gyan Mudra is practised palms upward, resting open on the knees — a receiving posture, and one that reliably draws energy and attention upward through the body toward the head. It is the mudra of study, of morning pranayama, of anything that asks the mind to be alert and gathered. It is also, for exactly that reason, a poor choice at ten at night, when the last thing a restless mind needs is more upward pull.
Chin Mudra turns the same hands palms down onto the knees, and something in the nervous system reads that turn as an instruction to settle rather than rise. The arms give their weight to the legs instead of holding it; the small, constant postural effort the shoulders make when the palms face up simply stops being asked for. People who switch from Gyan to Chin Mudra in the evening consistently describe it as the moment the day's energy finally has somewhere to go down into, rather than nowhere to go at all.
A simple rule to keep
Guruji's guidance, handed to nearly every beginner: palms up in the morning, palms down in the evening, and if a student only remembers one thing about mudra practice after their first week, this is usually it. It is a small rule, built on a small physical difference, and it is exactly the kind of detail this tradition tends to get right — not because the shape is different, but because the direction it faces changes everything about where the energy it gathers is asked to go.