it is digital in the sense of steps but then we have to be careful not to mistake digital and sampling rate; the very notion of “rate” comes FROM a “smooth reality” assumption; this notion that we can break up a smooth continuum into evenly spaced, evenly sized discrete steps, convenient because that happens to be oscillations which are modeled on hypothetical circles; and so when we are at DIGITAL we end up back at continuous because of our mathematical tools which are based on continuous reality assumptions from Newton’s time.