American artists have drawn criticism after making stunning, intricate sculptures by pouring hot liquid aluminium into anthills.

A handout picture provided by Solar Impulse on 18 March 2015 shows the Swiss solar-powered plane Solar Impulse 2, HB-SIB, taking off with Swiss explorer Andre Borshberg on board for the third leg Ahmedabad to Varanasi, of the Round-The-World, in Ahmedabad, India, 18 March 2015. Swiss explorers Bertrand Piccard and Andre Borschberg attempt to circumnavigate the world flying with an aircraft, with a 72 metres wingspan, powered only by solar energy without a drop of fuel. (Photo by EPA/Solar Impulse)

A woman dressed in Ukrainian national costume poses for a photograph in front destroyed Russian military equipment at Khreshchatyk street in Kyiv on August 20, 2022, that has been turned into an open-air military museum ahead of Ukraine's Independence Day on August 24, amid Russia's invasion of Ukraine. (Photo by Dimitar Dilkoff/AFP Photo)

A woman reacts as colour powder is applied to her face on during Holi celebrations, amidst the spread of the coronavirus disease (COVID-19), in Ahmedabad, India, March 29, 2021. (Photo by Amit Dave/Reuters)

A dog poses in traditional Chinese dress on Yaowarat Road in Chinatown on the eve of Lunar New Year on January 20, 2023 in Bangkok, Thailand. The Chinese diaspora of Southeast Asia is celebrating a lively Lunar New Year as COVID-19 restrictions have been removed. It is traditionally a time for people to meet their relatives and take part in celebrations with families. In Thailand, which has a sizeable population of Chinese lineage, people gather with family and celebrate with feasts and visits to temples. (Photo by Lauren DeCicca/Getty Images)

A man dressed in the likeness of the Hindu deity Agni Kandakarnan performs during the Theyyam ritualistic dance festival on March 14, 2023 in Somwarpet, India. Theyyam is a colourful socioreligious dance form that is the amalgamation of ritual, vocal and instrumental music, dance, painting, and literature and its genesis can be traced to the coastal regions of the southern Indian states of Kerala and Karnataka. (Photo by Abhishek Chinnappa/Getty Images)