http://en.wikipedia.org/wiki/Fock_state
Spectral representation of the falling in love process.

Spectral representation of the falling in love process.

That's why there's coffee...
Advisor: So, are you ok with getting here early?
Studente: Well, I'll try my best. The problem is that since I go to bed around 4 a.m., it's hard to wake up at 8 a.m....
Advisor: That's why there's coffee...