Great animation Mike.

Paul I'm not sure I follow you. The following quote appears to be perfectly displayed in Mike's animation:

Yīn (陰 or 阴 "shady place, north slope, south bank (river); cloudy, overcast"; Japanese: in or on; Korean: 음) is the dark element: it is passive, dark, feminine, downward-seeking, and corresponds to the night.
Yáng (陽 or 阳 "sunny place, south slope, north bank (river), sunshine"; Japanese: yō; Korean: 양) is the bright element: it is active, light, masculine, upward-seeking and corresponds to the daytime.
Yin is often symbolized by water and air, while yang is symbolized by fire and earth.
Yin (dark) and yang (light) are descriptions of complementary opposites rather than absolutes. Any yin/yang dichotomy can be viewed from another perspective. All forces in nature can be seen as having yin and yang states, and the two are in constant movement rather than held in absolute stasis.