The Sight and Sound debate aside which is all a bit of fun, it is very interesting why this film has grown and grown in stature. Some cultural critic will tell us why that is the case. There will be theories. Watching with 7 young students it was clear, like many of the 'greatest films of all time' it was a challenge for them not to fall asleep. However the slowness of the build up is, when you think about it, necessary to establish 'obsession'. Preminger's 'Laura' for instance, is too quick to do this successfully. What Hitchcock does differently are the special moments such as the dream sequence, yes, the 'ghostly appearance', of 'new''Madeleine', the composition of place, the camera tricks in the tower, and numerous others. It is definitely 'slow' but in the last third it is definitely 'disturbing' too where the sadness is all about male 'desire' which isn't love whatever Scottie says. It IS a fascinating film, no not the 'best' or really very 'tense' and the critics have their collective knickers in a twist in proclaiming it the best of all time. Yet, it lingers in the mind like a difficult poem or a Shakespeare 'problem play'. Difficult to love but everyone comes out of it creditably. Cinematography great. Acting, very good. Music seriously effective. And the 'hero' utterly compromised. He undressed her! But she was only a gal from Kansas!