What is art? Here is a definition from Google:
(art is) "...The expression or application of human creative skill and imagination, typically in a visual form such as painting or sculpture, producing works to be appreciated primarily for their beauty or emotional power."
Or this, from the Britannica on-line dictionary:
"...Something that is created with imagination and skill and that is beautiful or that expresses important ideas or feelings."
Now the question is, are these valid definitions? All art is simply the expression of human creative skill and imagination ? That sounds good enough for me, but I would have to add that art also has a deeply subjective value, either to the artist or to his patrons, or both. People are willing to spend time and money on producing art, and consuming art. There are both spiritual and material components involved here that the vast majority of us take very seriously.