People work at the construction site of the Wormhole Library in the Haikou Bay in Haikou, capital city of south China's Hainan Province, Jan. 6, 2021. The Wormhole Library is designed as a landmark in the public life in the Haikou Bay. (Xinhua/Zhang Liyun)

Aerial photo taken on Jan. 6, 2021 shows the construction site of the Wormhole Library in the Haikou Bay in Haikou, capital city of south China's Hainan Province. The Wormhole Library is designed as a landmark in the public life in the Haikou Bay. (Xinhua/Zhang Liyun)

Aerial photo taken on Jan. 6, 2021 shows the construction site of the Wormhole Library in the Haikou Bay in Haikou, capital city of south China's Hainan Province. The Wormhole Library is designed as a landmark in the public life in the Haikou Bay. (Xinhua/Zhang Liyun)

Aerial photo taken on Jan. 6, 2021 shows the construction site of the Wormhole Library in the Haikou Bay in Haikou, capital city of south China's Hainan Province. The Wormhole Library is designed as a landmark in the public life in the Haikou Bay. (Xinhua/Zhang Liyun)

Aerial photo taken on Jan. 6, 2021 shows the construction site of the Wormhole Library in the Haikou Bay in Haikou, capital city of south China's Hainan Province. The Wormhole Library is designed as a landmark in the public life in the Haikou Bay. (Xinhua/Zhang Liyun)

People work at the construction site of the Wormhole Library in the Haikou Bay in Haikou, capital city of south China's Hainan Province, Jan. 6, 2021. The Wormhole Library is designed as a landmark in the public life in the Haikou Bay. (Xinhua/Zhang Liyun)