Banksy - One Nation Under CCTV

I found this news on the
Coxsoft art blog. The British graffiti artist
Banksy has unveiled his latest work of wit, irony, and reality.
"One Nation Under CCTV" is painted on a wall in central London, which seems to be the CCTV camera capital of the world. It shows a young boy up a ladder painting the words, with a security guard and a dog on the ground watching him. To the right of the painting is an actual CCTV camera.
Here's what the Daily Mail is saying about the new Banksy work..
"Banksy pulled off an audacious stunt to produce what is believed to be his biggest work yet in central London. The secretive graffiti artist managed to erect three storeys of scaffolding behind a security fence despite being watched by a CCTV camera." Daily MailI just wonder how "audacious" the work is though. Erecting 3 storeys of scaffolding in a secure area with a CCTV camera looking over the painting makes me think Banksy had permission to do the work. Regardless, it is classic Banksy. If I was the owner of the building I would now cover the painting with some protective perspex as Banksy just added at least $100,000 to the value of the property.
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Who is Banksy?