Banksy's "Girl With Red Balloon" image "automatically shredded" after being sold at auction.
Earlier on Saturday, Banksy had posted a picture of the stunt's aftermath with the caption: "Going, going, gone..."
"It appears we just got Banksy-ed", said Alex Branczik, Sotheby's head of contemporary art for Europe, in a press release accompanied by photos of the weird episode.
The clip is captioned "The urge to destroy is also a creative urge" - a quote from 19th-century anarchist Mikhail Bakunin which Banksy attributes to Pablo Picasso.
And it could just be that it was he who remotely triggered a shredder built into the frame of the iconic piece, just as the hammer fell on its £1.042 million ($A1.9 million) sale.
The Banksy painting that self-destructed after being sold for $1.1 million has reportedly doubled in value after the controversial stunt. In the years after World War II, German-born artist Gustav Metzger pioneered "auto-destructive art", creating paintings using acid that ate away the fabric beneath.
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Is there any length to which the elusive street artist-turned-jester in the high court of fine art won't resort, in order to thumb his nose at art market values?
The shredding was equivalent to Banksy's vandalism in painting graffiti on the walls of buildings without the owners' permission.
There is no denying that what he did will probably go down as one of the greatest art stunts ever.
It was instantly recognisable as a Banksy to anyone familiar with his work. In that a shredder concealed within--as Banksy later confirmed through a video--ripped the artwork into shreds as the gathering first gasped in disbelief and shock, and then cries "It's so cool" could be heard above the din.
The art world was caught by surprise when his most famous work shredded itself seconds after selling for £1million at auction.
Fairey likens Banksy's "Girl With Balloon" prank to performance art: ephemeral but everlasting, regardless of how the auction house ultimately proceeds regarding the work's new buyer.
Could this man with the camera be the anonymous artist in action?
Another film of the auction appears to have captured the artist himself videoing the artwork being shredded.