Pixel matrix (OLED) and screw press: what they have in common

1. Step 1. Pixel matrix (OLED) — has part — Transistor. Each pixel is driven by thin-film transistors.
2. Step 2. Transistor — is part of — Flash memory. Each cell is a floating-gate transistor.
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.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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