Stereoscope and zip: what they have in common

1. Step 1. Stereoscope — has part — Lens. Lenses.
2. Step 2. Lens — is part of — Cinématographe. A lens.
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 — is used in — Trousers. Trousers were sewn with a needle.
6. Step 6. Trousers — has part — Zip. A fastener.

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