Orrery and personal computer: what they have in common

1. Step 1. Orrery — evolved into — Planetarium. Models of the sky.
2. Step 2. Planetarium — has part — Lens. Projectors.
3. Step 3. Lens — is part of — VR headset. Lenses.
4. Step 4. VR headset — has part — Display. A VR headset has two displays, one per eye.
5. Step 5. Display — is part of — Monitor. The heart of a monitor is the display: an LCD panel, once a picture tube.
6. Step 6. Monitor — is part of — Personal computer. A monitor.

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