Here’s 36,000 frames from all of the black & white Hitchcock films…
The position of each frame on the circle is determined by two variables:
1) position in the film — frames from the start and end are near the top (12 o’clock) and the frames from halfway through are at the bottom (6 o’clock), etc.
2) the position on the axis — calculated from the average brightness of each frame, with darker frames near the centre, and brighter frames further out.
I’ve also done the same for individual films. I’m not sure if it’s possible to guess the film, but it’s interesting to see the differences between them all. They remind me of ink blots and paper chromatography experiments in science lessons