Once you are familiar with Fourier series expansion, you start seeing everything as a signal that can be broken up and manipulated in interesting ways. From sil

Once you are familiar with Fourier series expansion, you start seeing everything as a signal that can be broken up and manipulated in interesting ways. From silly stuff like a talking piano (https://youtu.be/-6e2c0v4sBM https://youtu.be/-6e2c0v4sBM), to more complicated and useful inventions like jpeg, real time dynamic light rendering (spherical harmonics), and countless others.