Kant discovered that the direction-patterns of coastal winds are the result of rhythmic thermal expansions and contractions of air columns over coastal and marine surfaces (1:223–4; 1:492–4). But weather is not only due to the push and pull of energies, the interaction of force (thermal radiation) and space (air columns over surface). As winds are motions in space, other motions may drive them on. Rotational forces—investigated in the earlier Spin-Cycle essay—are especially important. They were Kant’s key for his discoveries, later confirmed, of the dynamic weather cycles responsible for trade winds, equatorial winds, and the monsoon.