Book spine and monitor: what they have in common

1. Step 1. Book spine — is part of — Codex (book). Sewing the signatures together.
2. Step 2. Codex (book) — evolved into — E-reader. An electronic book.
3. Step 3. E-reader — has part — Electronic ink. An electronic ink screen.
4. Step 4. Electronic ink — uses — Electromagnetism. The pigment moves in an electric field.
5. Step 5. Electromagnetism — is used in — Cathode-ray tube. The beam is deflected by a magnetic field.
6. Step 6. Cathode-ray tube — is part of — Monitor. The first monitors were CRTs.

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