0,2 m3 - Mobile office for coworking. Chair contains drawer/safe to hold your stuff, and back folds down to fit under table. It can be stored on a shelf when not in use, since it only takes up 0.2 cubic meters (about 7 cubic feet).
If you're looking for bunk beds for younger children, these are your best bet. We have my one-year-old and three-year-old in these and they are perfect. Not as high as typical bunk beds, plus they feature stairs (that double as drawers) instead of a ladder.