Binoculars and knife: what they have in common

1. Step 1. Binoculars — has part — Lens. Objectives and eyepieces.
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 — evolved into — Overlocker. A specialized sewing machine.
5. Step 5. Overlocker — has part — Knife. A knife for trimming the edge.

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