The alternating current results in the two different magnetic field directions, B1 and B2, corresponding to each current direction market by green and red. For simplicity let us look at the instantaneous moment when the two loops are perpendicular to one another. On the left side, the current is moving downwards (V1), the magnetic field is to the left, which means that the force is moving into the plane of the page (F1; this is a basic law of physics). An instant later, on the right side, the current is moving up (V2), the magnetic field has switched to the right, and the force is moving out of the plane of the page(F2). Looking from above, these two forces generated will work together to spin the smaller loop in the clockwise direction as long as each current is still generated. Because the smaller loop is attached to the spinner, the body of the spinner displaces water as it moves, thus creating the vortex that results in the deadly whirlpool of the seaswallower.
In evolutionary terms, this sort of complex system could very well be explained by an initial symbiotic relationship. This is analogous to the mitochondria cells in humans. Although they are a vital part of our functions as we live today, genetic evidence indicates that the mitochondria separately from humans, only to join up with them later in a symbiotic relationship. This idea can be observed upon closer inspection of the spinner.