南笙孤风北笙凉风
[nán shēng gū fēng bĕi shēng liáng fēng]
'南笙孤风北笙凉风' literally means the south sheng lonely wind, north sheng cool wind. It's like talking about the distinct and separate yet complementary nature of things in life using the imagery and contrast of winds from opposite directions on a traditional Chinese musical instrument.