We used to have a 2 x 5 unit that we put perpendicular to the wall near a corner, then we could have books on both sides. Another shallower Billy bookcase against the wall at the corner made that part of the room into a little library area. We organized the books with heavy ones at the bottom, and never had to worry about stability.
I wonder if that will be possible with the new design though: Ikea furniture seems to be getting weaker and less suitable for remixing, although it still does its original job if you don’t put too much strain on it.
