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Re:An animated introduction to the Fourier Transform [video] by ablaba on Sunday January 28, 2018 @08:33AM (#16251228)
This fourier transform simulation example from shadertoy is good.

https://www.shadertoy.com/view/ltKSWD

Re:An animated introduction to the Fourier Transform [video] by codegladiator on Sunday January 28, 2018 @08:40AM (#16251255)
The link kills my MacBook Pro. Makes the system unresponsive.