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Re:An animated introduction to the Fourier Transform [video] by jacobolus on Sunday January 28, 2018 @05:01AM (#16250636)
Perhaps you can explain what you mean by “exploration of what happens” and “terms of the transformation”? That’s pretty vague as a description of a visualization.

Maybe you’re talking about a visualizing a discrete Fourier transform?

Re:An animated introduction to the Fourier Transform [video] by nwatson on Sunday January 28, 2018 @05:51AM (#16250755)
Yep, it's vague, sorry, I'll need to try my hand at a video.
Re:An animated introduction to the Fourier Transform [video] by probinso on Monday January 29, 2018 @10:43AM (#16258090)
the source code brown brown blue uses for animations is open source