foo1:  I'm a blue cube. Each side has length=1.2. Serial number = 1
foo2:  I'm a cube. Each side has length=1.2. Serial number = 1
foo3:  I am a box with length=1.2, height=1.2 and width=1.2.  Serial Number = 1


Sizes:
   sizeof(Box) = 16
   sizeof(Cube) = 16
   sizeof(ColorCube) = 20