A child is riding a carousel, while holding a bar magnet and an electrically charged ball, with a magnetometer at the centre of the carousel. When the carousel stands still, the spin dipolar contribution is represented. when the child only has an electrically charged ball and the carousel rotates, this is the orbital contribution. when the carousel rotates, the child has an electric charge and the child walks around on the carousel, sometimes going near the centre, this is the fermi contact contribution.