Relationships
Yin and yang, cold and hot, no and yes, everyone knows the basic dynamics of a relationship. Every pair is the diameter of a circle; all relationships are circular; no escaping the opposite flow; we are more alike, than different; one of us yin-cold-no; the other yang-hot-yes; and then we change places. (Image: http://www.ics.uci.edu/~eppstein/junkyard/circles-in-ellipse.png )