The table is like a solid cube. Until it opens It has a flat service when it is closed or not, which is a characteristic of a table. Either way it is a table. it could be a side table when it looks like a cube or dinner for two when you pull it apart.
Artists Naoki Hirakoso and Takamitsu Kitahara built this wooden surface called the Kai Table, complete with a bunch of “secret” compartments — probably more accurately described as storage compartments; they don’t seem too secret.
The Piano Shelf: New York based artist and designer Sebastian Errazuriz . It folds flat when not in use, occupying zero space in the room. Once you need to store something – simply unfold the sufficient number of ‘keys’ to accommodate the item.