Although I viewed this film over 40 years ago, it still comes back to my mind from time to time. It packs an emotional punch that is rarely seen in cinema today. The young Keir Dullea gives a very convincing performance as a highly intelligent, but mentally disturbed young man. The cinematography is excellent, burning images into the mind that are still there 40 years later. I recommend this film highly to anyone interested in the cinematic art, as well as those who enjoy a strong story. The fact that the film was shot in black and white is a definite plus. It tends to accentuate the starkness of David's world and subliminally takes the viewer into a world of absolutes, where shades of gray have no place.