Fourier transform and gas lamp: what they have in common

1. Step 1. Fourier transform — is used in — Digital signal processor. Spectral processing.
2. Step 2. Digital signal processor — is part of — Smartphone. Processing sound and images.
3. Step 3. Smartphone — has part — LED. The camera flash.
4. Step 4. LED — is part of — Street light. LEDs.
5. Step 5. Street light — evolved from — Gas lamp. Gas lamps.

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