This drawing shows a closed cycle covering five octaves. But musical pitches are not a closed cycle, they keep going down and up from there. How can you take th

This drawing shows a closed cycle covering five octaves. But musical pitches are not a closed cycle, they keep going down and up from there. How can you take this drawing and extend it to an arbitrarily high or low pitch? Make it a spiral. What you're seeing is a spiral at an angle orthogonal to the angle of view. Imagine a spiral curling around the Z-axis, and a viewer looking straight down Z. The arms of the spiral aren't visible because they are occluded.