Comb and camera: what they have in common

1. Step 1. Comb — is made of — Bone. Ancient combs were carved from bone and antler.
2. Step 2. Bone — is material for — Spectacle frame. The first frames were made of bone and horn.
3. Step 3. Spectacle frame — is part of — Glasses. A frame.
4. Step 4. Glasses — evolved into — AR glasses. Glasses with a display.
5. Step 5. AR glasses — has part — Smartphone camera. Cameras.
6. Step 6. 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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