《资治通鉴·隋纪·隋纪六》
炀帝在观文殿前设十四间书室，书室的窗户、床褥、厨幔，都极为珍贵华丽。每三间书室开一个双扇门，垂下锦质的幔帐，上面有两个飞翔的仙人，户外的地面上设置机关。
于观文殿前为书室十四间，窗户床褥厨幔，咸极珍丽，每三间开方户，垂锦幔，上有二飞仙，户外地中施机发。
Emperor Yang set up fourteen book rooms in front of the Guanwen Hall. The windows, bedding, and kitchen curtains of the book rooms were extremely precious and gorgeous. Every three book rooms opened a double-leaf door, and a brocade curtain was hung down, with two flying immortals on it, and a mechanism was set up on the ground outside.