Video compression and parachute: what they have in common

1. Step 1. Video compression — uses — Discrete cosine transform. DCT.
2. Step 2. Discrete cosine transform — evolved from — Fourier transform. A related transform.
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 — uses — Rope. A rope runs over the pulley.
6. Step 6. Rope — is part of — Parachute. The lines are ropes.

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