So we would have the child going around the carousal as that represents a classic electron going around an atom. If they are holding a bar magnet that represents the electron’s spin-dipole field, if they were also holding the electrically charged ball that will generate a field as it is now a current since its moving around (like a normal electron does) and somehow if they space for a magnetometer (maybe in their backpack) that represents the fermi-contact field (?). Not really sure about that last one to be honest.