How Roman Polanski captivated the viewer in "Rosemary's Baby."

Rosemary's Baby (1968) by Roman Polanski is a movie that holds your attention from the beginning to end in a supremely intelligent way. The movie, which basically follows Ira Levin's satanic thriller describes about ten months in the life of a newly married couple, Guy and Rosemary. Polanski keeps his audience interested and alert by creating ambiguity, or confusion, between fantasy and reality. The confusion is created by the partial information that we get, the time …

…sounds and shadows; he places the plot in a gothic building in the center of Manhattan; gives us partial information, and makes us call into question things that people are saying. If we knew from the beginning what is this movie about - reality and madness or satanic plot - it would be less appealing. It is the tension, the puzzle to solve, the intellectual work we have to do - that keeps us interested.