Shameless plug: If you are interested in Fourier Transform and signal processing you might enjoy my somewhat artistic 3D visualisation of the fourier transform as well as the fractional fourier transform [1]
(Fractional fourier transform on the top face of the cube)
And for short time fourier transform showing how a filter kernel is shiftes across the signal. [2]
(Fractional fourier transform on the top face of the cube)
And for short time fourier transform showing how a filter kernel is shiftes across the signal. [2]
[1]: https://static.laszlokorte.de/frft-cube/
[2]: https://static.laszlokorte.de/time-frequency/