Simple stairs have just two components. The flat board that your foot steps on is called a tread. The treads connect to side stringers and sometimes to one that is in the middle of the stairs. The ...

Watch the Endless Stair come to life in front of the Tate Modern The playful Escher-esque structure consists of interlocking flights of wooden stairs that can be infinitely reconfigured. The ...

The Blade Stair, as Diller Scofidio + Renfro calls it, refers to a four-flight stairway wrapping around a 6-inch-thick steel central wall suspended from the sixth floor. (The final flight, extending ...