My own sofa / My own sofa

Allowances that I hide from my mom.
A present that I prepare secretly for my lover.
A piece of snack that I hide from my brother.
 
What if there is a secret place that only I know to hide stuff?

**
Cushions are piled up in a frame of a hexahedron.
If turning piled cushions over, they become a sofa.
Back support side and the height of sofa can be
adjusted according to the number of cushion
turned over, and if turning over the last cushion,
a secret place will be seen to keep my personal items.
 
Knobs that are exposed to outside mean a secret of the sofa.