I will always answer this question with only one word: EMOTIONS! Does that art piece speak to your soul? Does it arrive straight to your guts? Do you feel that you would paint, sing, or write exactly like that if you could paint, sing, or write exactly like that? Do you want to.
Yes absolutely! Everything that creates an emotion is ART and abstract works can for sure create emotions I think that if something communicates to you, that is already art. From the outside, it might seem that abstract paintings are just a bunch of colors and shapes randomly put on the canvas,.
This is an interesting topic! I think it is possible, it might sound impossible but it is! Personally my heart beats when I see something painted in oil, with a lot of texture and with an imperfect, impressionist or expressionist style. This is also what I try to create, I need.