First, I'll tell you what Gyonghoeru is. 

Gyonghoeru is for resting and hosting parties. It's the main party place and one of the National treasures. I've always thought of resting and having parties here. 

Also, there is a square pond around it. When I went there, it was frozen because the weather was cold.

Now I'll tell you the meaning of the square and circle pillars.

The square pillars are on the outer part which means earth. The circle pillars are in the inner part which  means heaven. And the two pillars represent for harmony. This comes from Yin Yang theory. 

I'm impressed about the idea they had.

In conclusion, I learned that the pillars represent for harmony. 

I want to come here again and have more experiences. 

Thank you