Brain sculptures are seen at the Brain Project art exhibition in Nathan Phillips Square Pond in Toronto, Canada, on July 21, 2021.Photo:Xinhua

People look at brain sculptures at the Brain Project art exhibition in Nathan Phillips Square Pond in Toronto, Canada, on July 21, 2021.Photo:Xinhua

A brain sculpture is seen at the Brain Project art exhibition in Nathan Phillips Square Pond in Toronto, Canada, on July 21, 2021.Photo:Xinhua

People look at brain sculptures at the Brain Project art exhibition in Nathan Phillips Square Pond in Toronto, Canada, on July 21, 2021.Photo:Xinhua

A man looks at brain sculptures at the Brain Project art exhibition in Nathan Phillips Square Pond in Toronto, Canada, on July 21, 2021.Photo:Xinhua