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By virtue of being subjective, you can't decide what is art or not. You can say for me this isn't art. And there are plenty of "art" made by humans that I wouldn't consider so, but someone does hence they are art.

It's true, I think it's a matter of belief and personal choices. what is art for me may not be for you and vice versa.

That is why it is important to study aesthetics, as it is one of the only ways to truly understand what art actually is.

I think that aesthetics are completely unnecessary, since one of the principles of art is to provoke sensations and feelings. If no one felt anything, the concept of art would never exist.

Sorry, but I feel like you don't know what aesthetics is

Actually, this is more of a subjective concept, hahaha