These mandalas were created from multiple mandalas into yin-yang mandalas.
The yin-yang symbol (or taijitu in the Taoist tradition) has been around for centuries. It demonstrates the duality of nature. The symbol is purposefully represented to suggest a swirling motion. This means that all positions of the interaction are constantly changing which relates the idea of balance. They interact to form a whole greater than either separate part. Just as a state of total yin is reached, yang begins to grow. Yin contains seed of yang and vise versa. They constantly transform into each other. There is always some yin in yang and yang in yin; thus, the small circle of each in the other. They cannot exist without each other.
Yin commonly refers to femininity, passivity, darkness, winter, cold, north, water, moon, gentle, soft, diffuse, stillness, earth, matter, and contraction, to name a few.
Yang commonly refers to masculinity, aggressive, light, summer, hot, south, fire, sun, tough, hard, focused, activity, sky, energy, and expansion, to name a few.