The child is sitting in the centre of the carousel and I treat it as a nucleus. This carousel has a few seats and I put a bar magneton one of them. This bar magnet generates the magnetic field that can be felt by the nucleus in the centre (a child). So it is the spin dipolar contribution. Then I put an electrically charged ball on one of the seats. This ball I can treat as a charge which is orbiting around the nucleus. Here the current appears and it generates the magnetic field. It is the orbital contribution. I can also put the ball in child’s hands, so in this case, the electrons enter the nucleus and I have the Fermi contact contribution. In each case I can measure the magnetic field contribution with magnetometer.