Designers Gabriella Gustafson & Mattias Ståhlbom from TAF [1] were commissioned by a family in Stockholm, Sweden, to create a staircase in this cramped space.

To see the designers' surprising solution, just

The left-side photo shows the staircase looking up, while the right-side photo shows what the stairs look like from the top of the staircase. I love this design, but I wonder if sleepy stair travelers might go bump in the night if they don't pay attention to the pattern of the stairs.
Source [2]