WARNING: The permanent magnet has a considerable field - keep wallets and watches away.
Theory: When exposed to a magnetic field, the individual steel balls will act as tiny magnets. They will form chains aligned in the direction of the field.
Description: Place balls in chains of about 5 balls at various points around the magnet, especially near the poles. One long chain, with one ball missing in the center, strung across the gap is also useful.
Setup time: 10 minutes