Kodak camera and plough: what they have in common

1. Step 1. Kodak camera — uses — Photographic film. Roll film.
2. Step 2. Photographic film — is used in — Cinématographe. Perforated film.
3. Step 3. Cinématographe — was inspired by — Sewing machine. Louis Lumière said he came up with the intermittent film feed while watching the fabric feed of a sewing machine.
4. Step 4. Sewing machine — has part — Needle. A needle with the eye near its point.
5. Step 5. Needle — uses — Wedge. The point pushes the material apart like a wedge.
6. Step 6. Wedge — is used in — Plough. The ploughshare parts the soil like a wedge.

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