I love the idea of black glass in contrast with natural or warm spaces, like wood or warm stone. There's a contrast in temperature, as well as quality of material. To me, wood is organic and connected to emotion while black glass is sleek and impartial.
A sliding wood door defines this modern bathroom, while hidden lighting has been used in the floor, creating a soft glow and lighting up the mostly dark room. The white tiles help to reflect the light throughout the space.