Arc lamp and gutenberg printing press: what they have in common

1. Step 1. Arc lamp — is made of — Graphite. Carbon electrodes.
2. Step 2. Graphite — is a kind of — Carbon. A form of carbon.
3. Step 3. Carbon — is material for — Laser printer. Toner is carbon black in resin.
4. Step 4. Laser printer — is a kind of — Printer. A printer.
5. Step 5. Printer — works like — Gutenberg printing press. A printer is a personal printing press: it transfers an image onto paper.

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