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I wonder what kind of exclusivity the buyer saw about the duct-taped banana to the wall.

Literally anyone can do that.

Some people even did it with an apple, and with other things too, only to make a joke about this absurd and surreal purchase.

And some people say that this has nothing to do with art, but simply money laundering.

It's a concept, not a physical thing and you have to come up with something original. I can't say I appreciate it all, but I think some artists are trolling their audience