Blow Up, which I think came out in 1966, with David Hemmings and Vera Miles. It is a rather strange story of a fashion photographer who takes some pictures in a park of a man and woman, and thinks he witnesses a murder. He takes a frame and enlarges it, and enlarges it again, and if you look at the final enlargement, it looks like a body on the ground. Someone breaks in to his studio while he is out and takes all of the film and pictures, except for one enlargement, the final one he made, which falls behind a couch, which is all he has left to show for what he saw, and the picture is just blobs of varying sizes close up, but look like the body on the grass if you stand back a ways. I have watched this movie several times and I STILL find it fascinating. I am not really sure it qualifies as "complicated", but it sure seems complicated to ME.