Instant messenger and camera: what they have in common

1. Step 1. Instant messenger — uses — Internet. The Internet.
2. Step 2. Internet — has part — Optical fibre. The backbones are optical fibre.
3. Step 3. Optical fibre — is part of — Endoscope. Flexible endoscopes use optical fibre.
4. Step 4. Endoscope — has part — Smartphone camera. Video endoscopes.
5. Step 5. Smartphone camera — evolved from — Camera. A smartphone camera keeps the layout of a camera: a lens forms an image on a light-sensitive surface.

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