Gaiwan in China has a good metaphor.
the Lid represent the heaven, The Tray represents the earth, and the bowl represents the man. It means The combination of man and heaven and earth. It is a good moral. This means always praise the man who is meditating so that forget the noise.
How to brew the tea with Gaiwan(Tureen):
We need to use hot water to wash the Tureen before brewing the tea, Then add the tea. The Next Fill with water, the Last cover it by the lid.
And the time can be according to individual taste.