A visitor sanitizes his hands at the entrance of the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People walk past an artwork during the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

A woman looks at an artwork during the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

A visitor sanitizes his hands at the entrance of the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

A visitor attends the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People look at artworks during the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

A woman looks at an artwork during the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

A woman walks past an artwork during the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People walk past an artwork during the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

Visitors sanitize their hands at the entrance of the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

A woman looks at artworks during the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

Staff members work at the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

A woman looks at artworks during the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

A bottle of hydroalcoholic gel is seen during the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)

People attend the preview of the Art Paris 2020 held at the Grand Palais in Paris, France, Sept. 9, 2020. Originally scheduled for April, Art Paris, France's second-biggest modern and contemporary art fair, opens its door to the public from Sept. 10 to 13. (Xinhua/Gao Jing)