Thank you Vaughn , I liked the sun lit room at different times of day effect on Benazir Butto print very much. I think its a highly complicated chemistry to stick print on glass. If I am not wrong , he is printing 4 different layers to 4 different glasses and stack them. I think it causes lots of reflections , effect of thick glass coloring and loss of sharpness. May be it would be better to stack polyester films. Is it possible ?