Mess around with it. Note that the Reset button is not just a functional clone of the green flag; it only places Scratch Cat back to their initial center position and velocity. Also note that the depth factor decreases the space between layers as it gets higher, not the other way around.
Just an experiment to apply trigonometry to spirals rather than using rotate functions. Surprisingly easy, I feel like doing it this way has probably helped a lot of younger programmers learn more advanced math.