nature is so clever to create the variety of thing and animal which may alike but not the same or identical.
-There is no two same persons, even with the same mind. (maybe we have more peace than war because of this)
-There is no two same thing, even the currency. (it has different number, touch by different people)
-There is a pair for thing, called YIN and YANG, known as man & woman, poor & rich…
it is nature. and the world is beautiful in the eyes of the happy man.
the black is known as dark, feminine, down side call Yin. and the bright side is Yang, male, upper side.