Semaphore tower e monitor: o que têm em comum

1. Passo 1. Semaphore tower — faz parte de — Optical telegraph. A tower with movable sails.
2. Passo 2. Optical telegraph — utiliza — Lens. Signals were read through telescopes.
3. Passo 3. Lens — faz parte de — VR headset. Lenses.
4. Passo 4. VR headset — tem como parte — Tela. A VR headset has two displays, one per eye.
5. Passo 5. Tela — faz parte de — Monitor. The heart of a monitor is the display: an LCD panel, once a picture tube.

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