Parchment and mechanical clock: what they have in common

1. Step 1. Parchment — is material for — Codex (book). Early codices were made of parchment.
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 — evolved from — Alarm clock. The alarm clock moved into the phone.
6. Step 6. Alarm clock — is a kind of — Mechanical clock. A clock.

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