Bagging area scale and camera: what they have in common

1. Step 1. Bagging area scale — is part of — Self-checkout. It checks the weight of the goods.
2. Step 2. Self-checkout — has part — Touch layer (capacitive). A touchscreen.
3. Step 3. Touch layer (capacitive) — is part of — Display. Under the glass is a touch layer that registers touches.
4. Step 4. Display — is part of — VR headset. A VR headset has two displays, one per eye.
5. Step 5. VR headset — evolved from — Stereoscope. Two images for two eyes — the idea of the stereoscope.
6. Step 6. Stereoscope — uses — Camera. Stereo pairs of photographs.

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