This YouTube video is the best example of a Shepard Tone I've heard: https://www.youtube.com/watch?v=OsBanpBQj0k
In a dystopian way it's the ever rising desire of intensity and panic for the economy to eternally grow.
Similar to the visuals of this eagle's wing and lion's fur: https://i.pinimg.com/originals/e5/34/b3/e534b3beef8e2e2d5765... continually flowing outward, but the overall look staying the same. Together they have become how I think of human generations ; forever birth, aging, death of individual people outflowing to the isolated edges of old age, but the overall structure holding. Differnt to a river made of individual water drops or history repeating like a spiral.