Perforated floating stainless steel.  “A shimmery staircase made of perforated stainless steel is suspended from the upper level. This quirky flourish of vertical circulation hangs in midair, stopping short of three hefty wooden slabs stacked like butcher block to make up the bottom steps—”fighting gravity,” as Peña describes it. “The stair is an alien that invades the surrounding space, bringing focus and order.