The balcony windows are sealed. Can you install invisible windows?

Of course. According to Zuo Daoyun's inquiry, the balcony window is sealed, and invisible windows can be installed. In architecture, it refers to a hole built in the wall or roof to let light or air into the room. According to historical records, in the Sui Dynasty of China, windows that can be opened and closed automatically appeared in the Guan Wen Hall of Luo Yang Palace in Wei Zicheng.