Microprocessor and elevator: what they have in common

1. Step 1. Microprocessor — includes — Digital signal processor. A specialized processor.
2. Step 2. Digital signal processor — uses — Fourier transform. Spectral processing.
3. Step 3. Fourier transform — is used in — Tide-predicting machine. A sum of harmonics.
4. Step 4. Tide-predicting machine — has part — Pulley. Pulleys add up the harmonics.
5. Step 5. Pulley — is part of — Elevator. The rope runs over a pulley.

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