terriseay The floor is Crema Marfil marble. Travertine is way too porous to polish like this. Also, when you're on the Houzz site if you look under the 'Products' tab you'll find much of the items used.
With all this rotation, we should discuss movement along a diagonal. In this example, the diagonal created by the straight wall below the chair rail creates a longer route to travel, while the stepped wall provides places for the eye to rest. The stepped wall makes this hallway a place to enjoy rather than a passage to rush through.
I love the contemporary, clean, "art gallery" vibe. I would want modern elements like this incorporated into my house - while also keeping it comfortable.