There are no twists or bends on this standard staircase, which begins on one floor and continues straight up to the second.
These are formed when a set of stairs twists 90 degrees with a landing that allows them to continue.
Typically, U-shaped stairways ascend in one direction until they reach a huge landing, where they turn around and continue ascending in the opposite direction.
Floating stairs are either supported by a central stringer that allows the ends to float or by stringers at the edge of each riser that allow the middle to float.
A spiral staircase's risers twist around a central pole, allowing it to ascend vertically without adding floor space.
One straight staircase branches into two curved staircases travelling in opposite directions.
These employ two stairs to reach the same floor. They can be curved or straight based on design or space needs.
A curving staircase usually starts with the first riser. Wedge-shaped steps bend gently to the next floor.