Axle and modem: what they have in common

1. Step 1. Axle — is part of — Wheel. A wheel turns on an axle.
2. Step 2. Wheel — is part of — Pulley. A pulley is a wheel with a groove for a rope.
3. Step 3. Pulley — is part of — Tide-predicting machine. Pulleys add up the harmonics.
4. Step 4. Tide-predicting machine — uses — Fourier transform. A sum of harmonics.
5. Step 5. Fourier transform — is used in — Digital signal processor. Spectral processing.
6. Step 6. Digital signal processor — is part of — Modem. Signal processing in high-speed modems.

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