Exceptional pendulum — Merkaba star

A pendulum cut from natural stone and hung on its fine chain; the balance is checked piece by piece, without which the swing drifts.

The motif. The merkaba overlays two inverted tetrahedra into a three-dimensional star, a figure of movement in the esoteric tradition.

The model. Merkaba star — one model from the collection, recognizable by its assembly.

In practice. Held with the chain free between thumb and forefinger, elbow resting. You first agree your movement conventions, then you ask. Hang it up rather than leaving it loose, so the chain does not tangle.

• A natural piece: shade, veining and dimensions vary from one example to the next

A decorative object for personal practice. It is no substitute for medical advice or treatment.