(BUS STATION)
Three bus stations symbolize "past", "present" and "future" respectively.

(PAST)
A chair represents an anxious new student who just entered the university.

(PRESENT)
A bench, representing students have found their own friends with mutual support. They found out common progress among themselves and treat each other shoulder by shoulder.

(FUTURE)
Chairs that had been messing around represent university friends had been scattered around, but their heart is still connected with each other and promise to keep in touch.