《太平广记·卷十八·神仙十八》
然后壁上突然开了一扇门，门里能看到天地日月，是另一个世界。
遂划然开一门，门中有天地日月。
Then suddenly a door opened on the wall, through which one could see heaven, earth, sun and moon; it was another world.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 遂划然开一门，门中有天地日月。 [/INST] Then suddenly a door opened on the wall, through which one could see heaven, earth, sun and moon; it was another world.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 遂划然开一门，门中有天地日月。
user
Then suddenly a door opened on the wall, through which one could see heaven, earth, sun and moon; it was another world.
assistant