Behind the scenes, Fourier identifies the frequency components of an image to allow image compression or feature enhancement. For beginners, it is useful to think about the system in flux as pixel values in space. Learn about image histograms and computer vision.
Images are signals, signals are waves, waves have frequency and phase
"The Matrix is everywhere. It is all around us. Even now, in this very room. You can see it when you look out your window or when you turn on your television. You can feel it when you go to work... when you go to church... when you pay your taxes." -Lana Wachowski