Chronology: When numbering the scenes chronologically, then sorting them how they appear in the film, the pattern becomes more clear. The letters A-V will represent the color scenes (with A happening chronologically first, and V chronologically last), and the numbers 1-22 represent the black and white scenes chronologically. The scenes appear in the film like this: 1, V, 2, U, 3, T, 4, S, 5, R, 6, Q...20, C, 21, B, 22/A[1] The two types of scenes alternate. The black and white scenes (numbers) start from the beginning, and work forward to the climax at 22/A, while the color scenes (letters) work backward from the climax at 22/A. The climax scene (22/A) changes to color halfway through, showing the convergence of the two story lines.