The Story Behind This Sofa
Finishing the back of a sofa properly is one of the clearest markers of how a piece was made, and it is almost never discussed.
On a standard sofa, the reverse is covered in a cheap lining cloth - sometimes not even the same colour as the fabric - and the frame behind it is left rough and unfinished. It costs less, it is quicker, and it works perfectly well as long as nobody ever walks behind the sofa. But it also means the piece can only ever sit flat against a wall, which quietly dictates your entire room layout for as long as you own it.
Building both faces to the same standard roughly doubles the carving on the back rail and adds a complete second upholstery job: the same panel shaping, the same pattern centring, the same tailoring. The frame itself has to be designed for it too - there is no hidden side in which to conceal tack lines, so every fixing has to be planned to fall where trim or carving will cover it.
It is more expensive to make. It is also the difference between furniture you arrange and furniture that arranges you.