Both inside and outside gPASSAGEh are tunnels following the garden with big trees. I think the symbol of the microcosm about big trees.

The main building, the courtyard, and the detached building are attached to gPASSAGEh. The resident can command a view of the mountain from the courtyard. Inside gPASSAGEh is not seeing as a mere corridor, a part of the room, and japanesegENGAWAh,and it has another function of each place too.