Spinning slotted drum and smart meter: what they have in common

1. Step 1. Spinning slotted drum — is part of — Zoetrope. A cylinder on an axle.
2. Step 2. Zoetrope — is made of — Paper. The pictures are on a paper strip.
3. Step 3. Paper — is used in — Gutenberg printing press. The impression is made on paper.
4. Step 4. Gutenberg printing press — works like — Printer. A printer is a personal printing press: it transfers an image onto paper.
5. Step 5. Printer — has part — Microcontroller. A controller processes the print job.
6. Step 6. Microcontroller — is part of — Smart meter. A microcontroller does the metering.

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