What is the symbolism of the figure "circle"?

Circle has the meaning of roundness and harmony, the Chinese people pay attention to the outer circle and inner square, which means that the inner integrity of the outer appearance should have a harmonious attitude, so that they can get along with each other. Relative to the square represents artificial, round represents natural, here means a beautiful environment close to nature it. There are also round can indicate reunion, meaning that the family is happy.