A canvas that sold for over a million dollars was shredded by its frame but no one is sure if it was destroyed or simply transformed.

A Banksy artwork “self-destructed” at a Friday night Sotheby’s auction in London.

“Girl with a Balloon” (2006) was the final lot of the evening sale at Sotheby’s and ended things off with an impressive final price of £953,829 (~$1,251,423), or £1,042,000 with buyer’s premium (~$1,367,104). Maybe people should’ve suspected something was suspicious when the artwork sold for the exact same figure as the artist’s previous auction record in 2008.

Robert Casterline of Casterline Goodman gallery was in attendance and told Hyperallergic what happened next. He explained there was “complete confusion” and an “alarm inside the frame started going off as the gavel went down.”

“[It] sold for over a million dollars and as we sat there…the painting started moving,” he said, and added that the painting’s frame, also made by Banksy, acted as a shredder and started to cut the canvas into strips. “[It was] all out confusion then complete excitement,” he explained.

Anny Shaw of the Art Newspaper spoke to Alex Branczik, the auction house’s head of contemporary art for Europe, who seemed as surprised as anyone. “It appears we just got Banksy-ed,” he said immediately after the sale. “He is arguably the greatest British street artist, and tonight we saw a little piece of Banksy genius,” he said, adding that he was “not in on the ruse.”

Shaw also reports that there was speculation “that the elusive artist had himself pressed the button that destroyed the work.”

But is the work destroyed? Or is it transformed? Even Branczik isn’t sure. “You could argue that the work is now more valuable,” Branczik said. “It’s certainly the first piece to be spontaneously shredded as an auction ends.”

Casterline clearly thought it was all very entertaining. “Banksy did it again to the art market that he so despises,” he said about the latest prank by an artist who continues to mess with the conventions of the art world.

Sotheby’s released a statement to the Financial Times: “We have talked with the successful purchaser who was surprised by the story. We are in discussion about next steps.”