Of the abstraction. The values for getRadius() or getCircumference() in the above example may very well be saved instantly, or they could be calculated, it would not issue towards the caller; the setters could possibly or might not have side effects; it would not issue on the caller. This mistake https://m3mcommercialplots.sport.blog/2025/06/01/touch-the-skyline-of-luxury-m3m-altitude/