A woman visits the exhibition of works by contemporary German female artist Amelie von Wulffen in Frankfurt, Germany, Nov. 29, 2013. The exhibition opened on Friday and will last until Feb. 2, 2014. (Xinhua/Luo Huanhuan)

People visit the exhibition of works by contemporary German female artist Amelie von Wulffen in Frankfurt, Germany, Nov. 29, 2013. The exhibition opened on Friday and will last until Feb. 2, 2014. (Xinhua/Luo Huanhuan)

A woman visits the exhibition of works by contemporary German female artist Amelie von Wulffen in Frankfurt, Germany, Nov. 29, 2013. The exhibition opened on Friday and will last until Feb. 2, 2014. (Xinhua/Luo Huanhuan)

A woman visits the exhibition of works by contemporary German female artist Amelie von Wulffen in Frankfurt, Germany, Nov. 29, 2013. The exhibition opened on Friday and will last until Feb. 2, 2014. (Xinhua/Luo Huanhuan)

People visit the exhibition of works by contemporary German female artist Amelie von Wulffen in Frankfurt, Germany, Nov. 29, 2013. The exhibition opened on Friday and will last until Feb. 2, 2014. (Xinhua/Luo Huanhuan)

A woman visits the exhibition of works by contemporary German female artist Amelie von Wulffen in Frankfurt, Germany, Nov. 29, 2013. The exhibition opened on Friday and will last until Feb. 2, 2014. (Xinhua/Luo Huanhuan)

People visit the exhibition of works by contemporary German female artist Amelie von Wulffen in Frankfurt, Germany, Nov. 29, 2013. The exhibition opened on Friday and will last until Feb. 2, 2014. (Xinhua/Luo Huanhuan)

People visit the exhibition of works by contemporary German female artist Amelie von Wulffen in Frankfurt, Germany, Nov. 29, 2013. The exhibition opened on Friday and will last until Feb. 2, 2014. (Xinhua/Luo Huanhuan)

People visit the exhibition of works by contemporary German female artist Amelie von Wulffen in Frankfurt, Germany, Nov. 29, 2013. The exhibition opened on Friday and will last until Feb. 2, 2014. (Xinhua/Luo Huanhuan)