Fabulous solution when space is too tight for a standard hinged door. You can also put furniture on the walls next to this opening, just leaving enough space behind the furniture for the doors to slide.
A small nook with a light, shelves, and drawer storage right under the stairs. Not only is it relaxing but it would make great use for the space under stairs, especially in a finished basement. It also looks comfy enough for children to use for sleep overs or severe weather.