A sculptor works on a piece of work during the 9th Tehran International Sculpture Symposium in Tehran, Iran, Nov. 23, 2019. More than 25 artists from Iran and other countries participate in the symposium. (Photo by Ahmad Halabisaz/Xinhua)

A sculptor works on his work during the 9th Tehran International Sculpture Symposium in Tehran, Iran, Nov. 23, 2019. More than 25 artists from Iran and other countries participate in the symposium. (Photo by Ahmad Halabisaz/Xinhua)

A sculptor works on her work during the 9th Tehran International Sculpture Symposium in Tehran, Iran, Nov. 23, 2019. More than 25 artists from Iran and other countries participate in the symposium. (Photo by Ahmad Halabisaz/Xinhua)

A sculpture is seen during the 9th Tehran International Sculpture Symposium in Tehran, Iran, Nov. 23, 2019. More than 25 artists from Iran and other countries participate in the symposium. (Photo by Ahmad Halabisaz/Xinhua)