Reaper and computer: what they have in common

1. Step 1. Reaper — has part — Crank. A crank moves the knife.
2. Step 2. Crank — is part of — Cinématographe. The film was advanced by turning a handle.
3. Step 3. Cinématographe — uses — Photographic film. Perforated film.
4. Step 4. Photographic film — is used in — X-ray machine. An image on film.
5. Step 5. X-ray machine — evolved into — CT scanner. Tomography from many images.
6. Step 6. CT scanner — uses — Computer. A computer reconstructs the image.

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