Professor Todd Herzog states that after the 11 September 2001 attacks , mass surveillance became commonplace . Herzog adds that '' Caché '' follows a tradition of cinema about surveillance , including '' Blow-Up '' ( 1966 ) and '' The Conversation '' ( 1974 ) , but that '' Caché '' is distinctive in being " about being looked at rather than looking at something or someone " . Haneke reveals life without privacy , Herzog writes . Qian He of the University of Washington writes the precise question of '' who '' is watching is the " question that haunts our daily life " ; '' Caché '' is one film that explores the question , answers to which have included Google , Big Brother and God . Philosopher William G. Smith tied Haneke 's ambiguity as to the sender of the tapes to philosopher Friedrich Nietzsche 's writings on interpretation , quoting Haneke : " There are 1,000 truths . It 's a matter of perspective "
11 September 2001 attacks
September 11 attacks
Caché (film)