Shutter and monitor: what they have in common

1. Step 1. Shutter — is part of — Camera. A shutter.
2. Step 2. Camera — is used in — Stereoscope. Stereo pairs of photographs.
3. Step 3. Stereoscope — evolved into — VR headset. Two images for two eyes — the idea of the stereoscope.
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.

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