That blue box there is a power line. There is another box that leads to the inside of the room, for light switch. The box facing the hall is part of a four-way switch that Gary made so that children (and adults) can turn off/on the lights from either side of the hall or from down the stairs. No groping, no trippin in the dark. The powerline is that yellow cable. That's a table saw in Juliana's room. That yellow rod is a leveling tool. (Gary would love a laser one which also comes with a stud-finder. A stud is that bar of wood that is sandwiched between the sheetrocks. Those are the only points were you could hammer/screw shelves/cabinets/frames, etc.).