Relationship of Yin-Yang in Five Chakra nature elements After reading this question about Chakra nature of Tailed Beasts. It came across my mind what is the relationship of the Yin-yang to the 5 Chakra nature elements? And how come you can classify a Chakra nature as Yin-Yang? Does it has something to do with the Chinese Zodiac or principles of Taoism?
For What is the relationship of the Yin-yang to the 5 Chakra nature elements?
Base from here:

Yin relates to one's spiritual energy and Yang relates to one's physical energy and it's necessary to utilise both of these in order to mould chakra for ninjutsu.
According to Yamato, the manipulation of Yin and Yang is the source of non-elemental techniques such as the Shadow Imitation Technique, Multi-Size Technique, medical ninjutsu, genjutsu, etc.

So in relation to 5 nature elements, I think it is the 6th type, having the techniques classified in this type as non-elemental techniques.
And about Does it has something to do with the Chinese Zodiac or principles of Taoism?
It is stated here that:

The concept of nature transformation parallels the real-life art, Onmyōdō (陰陽道; Literally meaning &quot;The Way of Yin and Yang&quot;), which is a mixture of natural sciences and occultism. It largely features Wu Xing and Yin and Yang.