Book-lined staircase by Levitate Architects.
Made of english oak shelving, this is an ingenious solution to a book storage problem. It not only stores books but this piece actually extended its London flat into the unused loft space above it, creating a new bedroom level and increasing the floor area of the flat by approximately one third. The staircase is hidden from the main reception area of the loft and a skylight and roof lights, light the new bedroom above.
Probably will need to do this in my future life