Urban living is often equal to compact living, do to increasing prices on housing in the worlds biggest cities, there is always a market for solutions that takes better advantage of the space of your apartment and house. So I came up with this idea for a combined door/drawers/stairs:
So if all the drawers are looked together it is a door to a closet. You can then pull out different drawers for storage. When you want to go up to the second floor of your apartment, you switch a handle, and you can swing out the drawers so they become steps on a staircase.