Массив указателей на классы

enum COLOR {RED, GREEN, BLUE};
 
class Shape
{
protected:
    int m_x, m_y;
    COLOR m_color;
public:
    Shape(int x = 0, int y = 0, COLOR c = RED);
    virtual ~Shape(void);
    virtual void WhereAmI(void); // { cout << "In class Shape"; }
};
 
class Rect : public Shape
{
    int m_right, m_bottom;
 
public:
    Rect (int left = 0, int top = 0, int right = 0, int bottom = 0, COLOR c = RED);
    virtual ~Rect(void);
 
    virtual void WhereAmI(void); // { cout << "In class Rect"; }
};
 
int main ()
{
    Shape* pShapes = new Rect[10]; //1)
    Rect* pRects = new Rect[10]; //2)
 
    for (int i = 0; i < 10; i ++)
    {
        pShapes[i].WhereAmI (); //тут ошибки для i > 0
        pRects[i].WhereAmI (); // тут всё ок
 
    }
}

dynamic_cast<Rect*>(pShapes)[i].WhereAmI ();

(pShapes + i*sizeof(Rect))->WhereAmI ();

    Shape* ar[]={new Shape, new Rect, new Rect(r) };
        for (int i = 0; i < sizeof(ar)/sizeof(Shape*); i ++)
        {
            ar[i]->WhereAmI (); 
        }

Shape* pShapes = new Rect[10];//1)
Rect* pRects = new Rect[10];//2)
 
delete[] pShapes;
delete[] pRects;