Modern stainless steel piping defines this staircase – along with the hanging light. Source
Metal brackets shape this modern floating staircase by OYO – and give an otherwise dull wall a pop of color.
Scala Origami, by Maretti, looks like origami paper. This metal staircase floats on air.
The above is the Oak Spiral Staircase with Metal Backbone by French designer Paul Coudamy. He has taken the standard spiral design to a new level, and made it into a stairway that expands the size of the steps as they get closer to the ground. The structural backbone is a metal post with triangular wedges supported by welded ribs.