Seven down the forearm, three at the finger

Once the box is on the bicep, the remaining strap is wound down the arm: seven turns around the forearm, then across the palm, then three at the middle finger — one around the middle joint and two around the base — and the end tucked away.

Seven and three. Ten turns of a strap.

⭐ This — and not the boxes — is where the numbers this app cares about actually live in the object. Seven on the forearm and three at the hand, which is the Sefer Yetzirah's own arithmetic on the alphabet and the Tree's own division into an upper three and a lower seven. It is a real correspondence and it is the strap's, not the box's; the box says four-and-one. Getting that the right way round is the difference between reading an object and decorating it.

⚠ And the direction is a live disagreement, which is to say the same ten turns spiral two opposite ways. The Ashkenazi custom winds toward the body; the Sephardi and Hasidic custom winds away from it. Same count, same strap, same arm, opposite handedness — and each is simply what is done where it is done. This app draws both and does not choose, which is the discipline it applies to the sway one room over and to the serpents two rooms over. Counts also vary in a few communities; seven is overwhelmingly the practice in both of the above.