The uncertainty principle

During the OPP class we've been speaking about observation, who takes part and how, and the fact that being observed changes the way we teach. Serge said in his blog that he was given the chance of observation, I see that as an opportunity. Anyway, I wanted to share with you a fragment of "The Man who Wasn't There" by the Cohen brothers. In this scene a lawyer explains the "Uncertainty principle" pretending to use it in court. Sometimes, observing a class, is also a little like this.