The footnote to your Norton here suggests that the gazebo is a summerhouse and by extension it's quite an extension the nationalist movement, and then, "even the whole temporal world."

书上的注释说,楼台指的是凉亭,可引申为民族主义运动，“甚至整个现世世界“

耶鲁公开课 - 现代诗歌课程节选