A visitor wearing a mask walks by a piece of artwork of Andy Warhol at the Pompidou Center on its reopening day in Paris, France, July 1, 2020. After over three-month closure due to the coronavirus pandemic, the Pompidou Center reopened to the public on Wednesday. Visitors must book a timeslot and reserve tickets on the website. Face masks are mandatory for visitors over 11 years old. Hygiene measures and social distancing rules must be respected during the visit. (Xinhua/Gao Jing)

"Face masks are mandatory for visitors over 11 years old" is seen on a TV screen at the Pompidou Center on its reopening day in Paris, France, July 1, 2020. After over three-month closure due to the coronavirus pandemic, the Pompidou Center reopened to the public on Wednesday. Visitors must book a timeslot and reserve tickets on the website. Face masks are mandatory for visitors over 11 years old. Hygiene measures and social distancing rules must be respected during the visit. (Xinhua/Gao Jing)

Sanitary measures are seen inside the Pompidou Center on its reopening day in Paris, France, July 1, 2020. After over three-month closure due to the coronavirus pandemic, the Pompidou Center reopened to the public on Wednesday. Visitors must book a timeslot and reserve tickets on the website. Face masks are mandatory for visitors over 11 years old. Hygiene measures and social distancing rules must be respected during the visit. (Xinhua/Gao Jing)

Signs marking social distance are seen on the floor of an elevator at the Pompidou Center on its reopening day in Paris, France, July 1, 2020. After over three-month closure due to the coronavirus pandemic, the Pompidou Center reopened to the public on Wednesday. Visitors must book a timeslot and reserve tickets on the website. Face masks are mandatory for visitors over 11 years old. Hygiene measures and social distancing rules must be respected during the visit. (Xinhua/Gao Jing)

People wearing face masks view artworks at the Pompidou Center on its reopening day in Paris, France, July 1, 2020. After over three-month closure due to the coronavirus pandemic, the Pompidou Center reopened to the public on Wednesday. Visitors must book a timeslot and reserve tickets on the website. Face masks are mandatory for visitors over 11 years old. Hygiene measures and social distancing rules must be respected during the visit. (Xinhua/Gao Jing)

A woman wearing a face mask takes a selfie at the Pompidou Center on its reopening day in Paris, France, July 1, 2020. After over three-month closure due to the coronavirus pandemic, the Pompidou Center reopened to the public on Wednesday. Visitors must book a timeslot and reserve tickets on the website. Face masks are mandatory for visitors over 11 years old. Hygiene measures and social distancing rules must be respected during the visit. (Xinhua/Gao Jing)

Staff members wearing face masks are seen at the Pompidou Center on its reopening day in Paris, France, July 1, 2020. After over three-month closure due to the coronavirus pandemic, the Pompidou Center reopened to the public on Wednesday. Visitors must book a timeslot and reserve tickets on the website. Face masks are mandatory for visitors over 11 years old. Hygiene measures and social distancing rules must be respected during the visit. (Xinhua/Gao Jing)

Gallery assistants pose with an artwork entitled Gelee Blanche, Jeune Paysanne Faisant Du Feu by Danish-French artist Camille Pissarro at Sotheby's Galleries in central London on January 29. Photo: AFP