// It is a subject Which may be different in each instance of a category personal int _field; // This can be a property that accesses a area, but because it's visibility // is safeguarded only subclasses will know concerning this property // (and through it the sphere) - https://propertyingurugram.in/gurugram-real-estate-booms-with-unprecedented-growth-fuelled-by-robust-infra-and-it-growth/