Folded parchment quires and modem: what they have in common

1. Step 1. Folded parchment quires — is part of — Codex (book). Folded sheets.
2. Step 2. Codex (book) — evolved into — E-reader. An electronic book.
3. Step 3. E-reader — has part — Flash memory. Memory.
4. Step 4. Flash memory — is part of — Smartphone. Apps, photos and data are stored in flash memory.
5. Step 5. Smartphone — has part — Digital signal processor. Processing sound and images.
6. Step 6. Digital signal processor — is part of — Modem. Signal processing in high-speed modems.

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