Traffic light and camera: what they have in common

1. Step 1. Traffic light — has part — LED. LEDs.
2. Step 2. LED — is part of — Pixel matrix (OLED). OLEDs are organic light-emitting diodes.
3. Step 3. Pixel matrix (OLED) — is part of — VR headset. OLED screens.
4. Step 4. VR headset — evolved from — Stereoscope. Two images for two eyes — the idea of the stereoscope.
5. Step 5. Stereoscope — uses — Camera. Stereo pairs of photographs.

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