A great space saving idea is the bookcase running up the stairwell.
These lead to the rooftop terrace. treads match floors. Like the railing and the bookcase.
Stairs of great products
carve out a sitting nook
Or perhaps you could turn wasted space under the stairs into a Harry Potter–style sleeping nook. With a nightlight and a curtain as the door, this would make a fun spot for visiting youngsters.
varying stair width on different sections
This contemporary staircase has curbed risers with a glass railing and a metal handrail.