From research, galleries and museums tend to have timber, concrete or epoxy flooring. This achieves some different effects. More matte materials with some roughness to them such as blasted concrete or timber, put the focus on the walls as there aren't any reflections occurring. However, I feel that this would really accentuate the main focus of my building, the play and motion of light.
Given this wave nature of the light manipulation, I wanted to experiment with marble. The organic motion within marble could play nicely off of the ripple like light that floods the building. I think that with a polished finish, the marble can reflect not only the light but the actual form of the skin. I think that this adds a really interesting effect where light and form meet. Having this level of reflection through polish also mimics water.
I experimented with concrete however, I feel that the marble adds some more interest.