Citizen Kane was the perfect “greatest movie of all time” for a period when cinema history was young and limited and could be fully grasped. CK could be placed in a context in which it was fully understood what came before it and what came immediately after it, and it’s importance was obvious. But now cinema has become too big and diverse to grasp from a singular point of view. It’s a mystery with too many meanings. So it’s “greatest movie of all time” should also be a mystery with too many meanings: Vertigo.