I have always been fascinated by the idea of complementary things...positive and negative space, night and day, soulmates, black and white etc. I just searched through the millions of items listed on etsy using the search words "yin yang" and found these fabulous examples. The creativity, variety and uniqueness of the artisans on etsy never fails to amaze me and I find new ones every time I do one of these Made By Hand By Me "Spotlights"! Click on any of the items to be taken to its etsy page.
According to Wikipedia ~ In Chinese philosophy, the concept of ying yang, often referred to in the west as yin and yang, is used to describe how seemingly disjunct or opposing forces are interconnected and interdependent in the natural world, giving rise to each other in turn. Yin and yang are complementary opposites within a greater whole. Everything has both yin and yang aspects, which constantly interact, never existing in absolute stasis.