Colour photography and lathe: what they have in common

1. Step 1. Colour photography — uses — Photographic film. Colour film.
2. Step 2. Photographic film — is made of — Celluloid. The first flexible film was celluloid.
3. Step 3. Celluloid — works like — Nail polish. Both are nitrocellulose: celluloid is a solid plastic, the polish is a solution of it that dries into a film.
4. Step 4. Nail polish — evolved from — Paint. Modern nail polish was modelled on the quick-drying nitrocellulose car paint of the 1920s.
5. Step 5. Paint — is material for — Matryoshka. It is painted.
6. Step 6. Matryoshka — uses — Lathe. Turned on a lathe.

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