Image sensor and gutenberg printing press: what they have in common

1. Step 1. Image sensor — is part of — Digital camera. Instead of film a digital camera has an image sensor.
2. Step 2. Digital camera — has part — Flash memory. A memory card.
3. Step 3. Flash memory — is part of — E-reader. Memory.
4. Step 4. E-reader — evolved from — Codex (book). An electronic book.
5. Step 5. Codex (book) — is used in — Gutenberg printing press. The press printed sheets that were bound into codex books.

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