I saw it in its first release in the 60s and several times in all its re-releases. It’s a movie that must be experienced on the biggest screen with the best print and sound to be fully appreciated. It was way ahead of its time. Unfortunately, audiences today have been de-intellectualized by Hollywood which thinks everything has to be fully explained by the narrative. 2001’s ambiguity was central to the appreciation of the film as a piece of art. It compels you to challenge your mind and your perceptions. If that is too much for the viewer, just kick back and enjoy the special effects which have been rarely equaled.