content: on a night in mid - autumn , an emperor of the tang dynasty once sat at wine with two sorcerers . and one of them took his bamboo staff and cast it into the air , where it turned into a heavenly bridge , on which the three climbed up to the moon together . there they saw a great castle on which was inscribed : " the spreading halls of crystal cold . " beside it stood a cassia tree which blossomed and gave forth a fragrance filling all the air . and in the tree sat a man who was chopping off the smaller boughs with an ax .
answer: it turned into a heavenly bridge , on which the three climbed up to the moon together .
question: what happened when the sorcerer casted his bamboo staff into the air ?
target: what happened when the sorcerer casted his bamboo staff into the air ?
references: what happened when the sorcerer casted his bamboo staff into the air ?