A dictionary.
From Miriam-Webster: "Art, meaning n.4: the conscious use of skill and creative imagination especially in the production of aesthetic objects". https://www.merriam-webster.com/dictionary/art
Aesthetics: a branch of philosophy dealing with the nature of beauty, art, and taste and with the creation and appreciation of beauty.
So as long as anyone finds beauty in it, and it's consciously made with skills and creative imagination, it's art.
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