A Shepard tone is an auditory illusion of perpetually rising or falling pitch. For some reason I applied this concept to the chord outlined during the chorus of "Hit the Road Jack."
Video is from a Russian screen-capture of the 2004 film "Ray" along with some Madelbrot zoom (https://www.youtube.com/watch?v=PD2XgQOyCCk) and a confused Travolta from Pulp Fiction.
