Staircase, Metal Railing, Metal Tread, and Wood Tread "We wanted it to be precision made with industrial materials, but to have an etherial iridescence that was soft to the touch. Through a long process of research and development with the fabricators, we created a finish that would do just this," says Ulanowski. Photo 9 of 17 in A London Penthouse Is Flooded With Dreamy Shades of Blue