Spectacle frame and personal computer: what they have in common

1. Step 1. Spectacle frame — is part of — Glasses. A frame.
2. Step 2. Glasses — evolved into — Sunglasses. Glasses with dark lenses.
3. Step 3. Sunglasses — has part — Polarizing filter. Polarized glasses.
4. Step 4. Polarizing filter — is part of — Liquid-crystal display. Polarizers.
5. Step 5. Liquid-crystal display — is part of — Monitor. Then LCDs.
6. Step 6. Monitor — is part of — Personal computer. A monitor.

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