Duality is quite important to the world, at least to my native point of view of the world ;-)
Before the invasion it meant that cities had two leaders, one to the hurin side and another to the hanan side. Traditionally one is the lower half and the latter the upper half, but both halves would be as brothers, not submission. So in the army were two leaders, and in every part of the life.
But duality is just a part of a bigger system of symmetries that includes more levels. And these symmetries are usually not exact but with differences in proportion that have correspondence with other levels of symmetry.
When I do anything, unconsciously I apply it to my designs, to my drawings, in my photographs, or even to simple things as the way I choose go to some place or another.
Qhapaq 