From 1728 to 1878, the Socci family of Ponte a Ema, a small town south of Florence, Italy, produced the finest furniture in Europe. Their clients expected the best and got it, including this desk now owned by the Louvre in Paris. It's one of four known examples of this remarkable design.
The whole unit folds away into a small table. Then, when needed, it expands with a built-in chair, writing desk, drawers, and leaves. You can see more photos of it and the other surviving models at Clostermann Antiques.
-via Core 77