crease and light

following this mornings conversation, I was thinking about how much light would be needed to illuminate the interior.  I am primarily relying on the translucency of the marble to achieve this.  I also thought it could be interesting, if massive areas got 'carved out' and allow natural light in.  It is important that there are no windows, so if there are creases in the marble, there could be a cutout behind the crease that would let a wash of light in