Safety pin and glasses: what they have in common

1. Step 1. Safety pin — has part — Spring. A coiled spring.
2. Step 2. Spring — is part of — Shutter. A spring mechanism.
3. Step 3. Shutter — is part of — Camera. A shutter.
4. Step 4. Camera — evolved into — Smartphone camera. A smartphone camera keeps the layout of a camera: a lens forms an image on a light-sensitive surface.
5. Step 5. Smartphone camera — is part of — AR glasses. Cameras.
6. Step 6. AR glasses — evolved from — Glasses. Glasses with a display.

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