Doppler effect and needle: what they have in common

1. Step 1. Doppler effect — is used in — Speed radar. Speed is measured from the Doppler shift.
2. Step 2. Speed radar — has part — Smartphone camera. A camera captures the licence plate.
3. Step 3. Smartphone camera — has part — Lens. A lens of several elements focuses the image.
4. Step 4. Lens — is part of — Cinématographe. A lens.
5. Step 5. 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.
6. Step 6. Sewing machine — has part — Needle. A needle with the eye near its point.

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