Block and tackle and monitor: what they have in common

1. Step 1. Block and tackle — has part — Pulley. A block and tackle is several pulleys and a rope.
2. Step 2. Pulley — is part of — Tide-predicting machine. Pulleys add up the harmonics.
3. Step 3. Tide-predicting machine — uses — Fourier transform. A sum of harmonics.
4. Step 4. Fourier transform — is used in — Digital signal processor. Spectral processing.
5. Step 5. Digital signal processor — is part of — Ultrasound scanner. Forming the image.
6. Step 6. Ultrasound scanner — has part — Monitor. A screen.

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