As I said earlier, art is never abstract.
Abstraction is the ability to generalize: an intellectual activity of the brain that can only succeed by excluding sentiment and emotion. The result can be a theoretical hypothesis, a mathematic formula, or a scientific analysis with rational conclusions. All very useful and important for many areas of human behavior and development. And very exciting when it leads to new inventions or better knowledge and understanding of reality.  I’m the last one to trivialize the value of it. Mankind owes the greater part of civilisation and technology to it.
To translate the results of abstraction into concrete measures and facilities communication is indispensable. All kinds of “language” – meaningful sequences of sounds, movements, images and/or letters, or a combination of these – can be used for this purpose.