masque
tower/non-tower (Xiang Nan Dou Pingping Cheng Liwei)
boat /non-boat (Ge Wenjun Ding Qing Zhang Yue)
bridge/non-bridge (Tan Gaofei Chen Yajun Zhu Wei)
space-time machine
cube (Zou Jingjing Zhao Jing Liu Fang Gu Yue Qian Yuzhan)
sphere (Wang Zhiqiang Zhang Chengwu Han Jian Zhang Yingdi Pang Bo Meng Yuan)
