looking back

i came to asu tonight to work--you know, grown up things like research and write papers and look at ways i can get published. but now, i'm working in the library as an instructor, and i'm sitting in the very spot i used to sit at when i was a student here. it's kind of weird looking at the young faces around me, knowing i was once one of them. how many more have passed before me, and how many more will pass after me, into my classroom, or just generally on campus?