In my opinion it is not art. That it is displayed in art gallery doesn't change this. It is a blank canvas waiting for some art to be applied to it.
The only art involved was the 'art of keeping a straight face whilst bullshitting about your latest artwork' which Mr Yves Klein is obviously a grand master at.
Even it is a 'vibrant' blue, it could just as easily have in dull blue, pale blue or a different colour altogether. The end result would have been the same.
Whoever paid money for it has been conned.
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