The stairway passage can act as an interior, yet in fact, there is never a clear division between inside and outside.
楼梯通道可以看作内部结构，但事实上，并没有内部和外部之间的明确定义。
2
This house has louver glass Windows at the tops of all exterior and interior cross-walls to allow ventilation throughout the house as well as up the open stairway.