Masonry Masterpiece

I see more than a little bit of Sol LeWitt in the bold, precise lines that course through this bath by Jean-Louis Deniot. But that's not paint on the walls or floor—it's stone. [Beige French limestone and grey Cascais limestone, to be specific.] The cabinet doors continue the pattern; are they mirrored or painted? I'll never tell—to do so would dilute the mystery of the space.