There are altogether a much shapes to think: L-shaped, straight, split, curved and spiral. Albeit some each serves an intention due to spatial idea and constraints, there are them which that do the job best and those that could have harm individual both financially & physically.
A staircase might be natural of a directly flight of steps with or without a landing among flights. Some other landings may be stand at the halfway spot or at a quarter point. Landings might also be used to shift the direction of a flight of steps. It may slew in an L shape or towards two directions in a T shape.