Very good question Ricardo. Art comes in many forms from painting, sculpture,to any kind of creative design. They can be a intricate painting to something ridiculous splatter of paint I saw done by an Elephant holding a brush with his trunk.
When is art and art, and when is it no more than a simple craft anyone can learn? My wife used to have a goal of learning some new craft every year, and one year she said she was going to learn how to make Jewelery. I said, "no you can't your are not a jeweler", and I'm a welder still thinking she will never do this one. Well she sure did learn it, and taught herself most of it. She got into the hand crafting of silver jelelery, and as it progressed, I got into the casting end of jewelery making. Of course, much of it is your own creative visions in what you make, however the basic process is a craft, that can be learned.
Like we learned Jewelry making, many people learn the basics of painitng, working with water colors or oils, and how to create a scene on canvas. Others learn how to make pottery, a craft learned and a process of using machines and tools again. I also learned how to make stained glass for many years, again another learned craft.
Back to the question, Define Art? Your guess is as good as mine, where I see art as "any vision, transfered from the mind to a finished product" I see art as the end product of conbining vision with knowing the craft or medium to express it. Carpenters do it, welders do it, architects do it, they are create from the visions in thier minds. They use their minds to make their hands, create something on to to something, like a canvas, from clay, on a building, etc. etc.
How do you value art? The Mona Lisa is one of a kind, made by they great master and priceless, buy my stained glass train is also one of a kind?
Thomas Kincade is a terrific artist, and makes nature pictures of grand homes in the woods where he uses lighting to illuminate the windows for a homey and warm look. He makes several issues per year, makes Lithographs numbered and signed, and they are limited editions. (some are unlimited). He reproduces and manufactures his art, so is that considered art, when you compare it to Di Vinci? Kincade is an great artist, but is he not just a factory, massproducing a product? Why is what he does, any differnt from a $5 poster on a sheet of paper?
What is art, and what is a craft, is a good question. We seem to be confused on it many times when it comes to art, confusing something that looks pretty from real art. Artistic scenes on tins are very popular around the holidays, but when you boil it down, a fancy painted tin like you might find a gift tin of cookies in, has no more manufactuing value, than a beer can or can for any other product. Yet we pay a premium price for the artistic scene on the tin can. They become one more Knick Knack in the cupboard and we can not bring ourself to toss them in the trash, but have no more value than an empty coffee can.
What is art, go figure!