What is the significance of the three men's heads

① the leftmost head, representing the university of ordinary, ordinary a student, thought many times to study well, may also be in a daze thinking about, and occasionally try to learn well, but can not control the freedom of the heart, eat, drink and play, but very satisfied with the self.

②The head in the center, representing some of the university students with good grades, always happy in the process of learning, learning tools and time may be the starting point of the dream.

③The head on the far right represents the university for the love of life and self-improvement of the good things, the extreme pursuit of art, life, ideals and love.

I think that in the university, these three kinds of people, although very common, are missing.