Very instructive! I've often seen where Bézier curves ("splines") are used to interpolate 'missing' data (for visualization, but also for analytical curve fitt

Very instructive! I've often seen where Bézier curves ("splines") are used to interpolate 'missing' data (for visualization, but also for analytical curve fitting) and always worry that hidden assumptions are thereby in place, (for instance: is nature, by default, 'smooth'?). If there was a reference discussing this situation, I'd love to be directed to it.