A baby was on the way (she's a girl!), and the clients wanted an entire space in the apartment sectioned off and built as a a nursery. The special French Doors were chosen to fit the style of the apartment. The overhead Transom Window was salvaged and refurbished in order to give light and air to the room.
The doors were installed as pocket doors to slide into the walls on either side.
This photo (better) shows how the added interior arch matches the existing one in the hallway.