Quill pen and electrical grid: what they have in common

1. Step 1. Quill pen — uses — Ink. It writes with ink.
2. Step 2. Ink — is used in — Printer. It prints with ink.
3. Step 3. Printer — has part — Microcontroller. A controller processes the print job.
4. Step 4. Microcontroller — is part of — Smart meter. A microcontroller does the metering.
5. Step 5. Smart meter — is part of — Smart grid. Meters.
6. Step 6. Smart grid — evolved from — Electrical grid. A digital grid.

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