Forget funding shortfalls, restitution claims and falling visitor numbers - given recent events you could be forgiven for thinking the greatest threat facing museums is a clumsy tourist armed with a mobile phone.

This time it is Florence's Uffizi Gallery left counting the cost of repair work after a man tore the canvas of a 1712 portrait of a Tuscan prince by Anton Domenico Gabbiani after losing his balance while posing for a selfie and falling into it.

Gallery director Simone Verde promised to "set very precise limits" on selfie-takers in future and said the man involved would be prosecuted.

Earlier this month, a crystal-encrusted chair by contemporary artist Nicola Bolla was damaged when a man posed for a selfie and fell on it at Verona's Palazzo Maffei museum.

Footage of that incident was shared on Instagram by the museum which said it wanted to use the publicity to "start a real campaign to raise awareness about the value of art and the respect it deserves".

American abstract painter Thornton Willis has died aged 89.

The Florida-born artist lived and worked in New York for many years where he was part of a flourishing scene in SoHo alongside contemporaries including Jack Whitten and Mary Heilmann.

His work, which often had starkly descriptive titles such as Zig-Zags and Slats, was marked by visible brushstrokes and imperfections.

A controversial El Greco work at the center of an international legal dispute is reportedly owned by Russian billionaire art collector Dmitry Rybolovlev.

The painting of Saint Sebastian was pulled from Christie's New York auction in February after the Romanian government said it belonged in its national collection and legal documents seen by The Art Newspaper say it will stay with the auction house "until Romania’s recovery efforts are heard and resolved by the proper legal authorities".

Legal documents also show the painting's owner at the time it was withdrawn was Rybolovlev, who previously owned Leonardo da Vinci's Salvator Mundi before it sold for a record $450 million.

He also made headlines with a long-running, but now resolved, legal dispute with Swiss art dealer and former freeport entrepreneur Yves Bouvier.

Rybolovlev has not commented on the case but Christie's confirmed they are holding the painting "while the parties involved resolve the issue".

Yinka Shonibare, Alison Saar and Hank Willis Thomas are among the latest beneficiaries of a project set up more than 20 years ago to bring contemporary art out of galleries and museums to find a wider audience.

Their work is on show along with that of 14 others at San Francisco's Fort Point - a civil war-era fort by the city's landmark Golden Gate Bridge.

Black Gold: Stories Untold is inspired by the lives of African Americans in California in the middle of the 19th century and includes monumental sculptures such as Shonibare's Man Moving Up and Willis Thomas' Solidarity which features a huge clenched fist as well as smaller, more intimate work.

The show, which opened this month, is curated by Cheryl Haines as part of the For-Site project which brings artists to work on US national park land.

She told Forbes the fact admission to Fort Point was free made the show different to one in a museum or gallery, saying: "If we can take these art projects and meet people where they stand, I think it's much more powerful because it's a joint discovery".

1 - Officials at the Montreal Museum of Fine Arts say they have found no "signs of damage" to Pablo Picasso's painting L'Hetaire after an environmental campaigner threw pink paint at the portrait, which was behind glass. A 21-year-old man was arrested after Thursday's incident which was claimed by environmental campaign group Last Generation Canada.

2 - Right-wing US blogger and software developer Curtis Yarvin said he wants to curate the American pavilion at the 2026 Venice Biennale. He told Vanity Fair his plan to "Trumpify the Venice Biennale" included teaming up with Dutch Egyptian artist Tarik Sadouma for a group show of work responding to Titian's masterpiece The Rape of Europa.

3 - The 2,700-year-old Kore of Thera marble statue, which was discovered in 2000, has returned to the Archaeological Museum of Santorini complete with a new protective base built to withstand earthquakes measuring up to 8 on the Richter Scale. The installation is part of a $859,000 renovation of the museum on the Greek island which has regularly been hit by earthquakes.