What I find most amusing about this age old argument is not the various definitions of art, but the people so eager to put confines and definitions on art as if they had some sort of special insight or monopoly on the truth. This type of discussion is always more illuminating about the people expressing opinions than getting any closer to understanding art or artistic expression.
Art must have a definition, it just can't be anything because without a specific definition, the term has no meaning. Words must have a meaning otherwise they're just gibberish. If you can understand any word I type, then you value the meaning of words just as much as I do. If art is everything and not something specific, then the term has no significance and makes it nonsense.
I don't think that communication is a prerequisite to anything being art. An artist can certainly paint, or write, or sculpt something without even knowing what it means, without any intent to communicate any particular idea. Art can simply be. The viewer likewise can see no message within the art or certainly read a different message from it that was never intended. This is okay. I don't even think art has to be made by man, that's a rather arrogant assumption IMO.
And again, "excellence" and "talent" are subjective terms. Art does not need a set amount of time to be created nor does it need any particular set of skills. These parameters are within the viewer's own head and their own narrow scope of what "something should be".
All the arts are forms of human communication, whether it's writing, painting, drawing, sculpting, music, dancing, film, computer graphics, video games, sewing, photography, even architecture. They all communicate something whether it's merely form, shape, color, line, or something a bit more complex like philosophy. Name something that's art and it'll fit into the confines of human communication. Jewelry for example is used to communicate wealth, Symbolism, power, cultural affiliation, or simply to adorn a persons body to get attention and make it more beautiful to others.
Skill is certainly a requirement.
Merriam Webster agrees:
Main Entry:
2art Listen to the pronunciation of 2art
Pronunciation:
\ˈärt\
Function:
noun
Etymology:
Middle English, from Anglo-French, from Latin art-, ars — more at arm
Date:
13th century
4 a: the conscious use of skill and creative imagination especially in the production of aesthetic objects; also : works so produced b (1): fine arts (2): one of the fine arts (3): a graphic art
To answer the question that started this thread, if someone crumples a napkin intending to communicate something, is that art? I'd have to say no because there's no real creativity or skill involved. Creativity is using your imagination. And there's no real Imagination being used when simply crumpling a napkin, it's just a crumpled napkin nothing else. If he creatively and skillfully folded it however, that's origami which most of everyone would consider that art. Just because someone communicates something to another person, doesn't make it art IMHO.