Bolt carrier and glasses: what they have in common

1. Step 1. Bolt carrier — is part of — Assault rifle. It reloads the weapon.
2. Step 2. Assault rifle — has part — Spring. A return spring.
3. Step 3. Spring — is part of — Shutter. A spring mechanism.
4. Step 4. Shutter — is part of — Camera. A shutter.
5. Step 5. Camera — has part — Lens. A camera’s lens.
6. Step 6. Lens — is part of — Glasses. Lenses.

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