Thinking from an all-age perspective, the relationship between "square" and "round" is like the character of a person at different ages, with "square" for "acting" and "round" for "using one's intellect", with "square" dominating the young and "round" dominating the old, and the hope that people will use "square" to give birth to "round", with "round" following "square", and that the two are complementary to each other, just as there is a need for complementary and mutual support among people.