To optimize the 3.70m height, we chose to make a mezzanine half height to integrate an office. In a concern of comfort and ecology we realized the wall giving on the outside in earth of 8cm thick on average. In this thickness we were able to integrate sconces in the drawing symbolizing for some montages or birds for others. The majesty of the chestnut tree has been enhanced by preserving it in one piece. fine foot creates an illusory very heavy tray.