Art is either a sociological process, that defines it's own ethics through definiton of esthetic or correct composing of word, pictures, sculptures movement etc. or an evolution that enhances scientific innovation beyond simple recognition of facts but improving standars through man made esthetic projections of reality , that somehow define man's own mind within the scope of his society. The richer the art-world of a society get's the more different brilliant ideas can be transferred to other disciplines.
There is no general definition of art, it varies with society, politics, religion etc. that's why it is so difficult to define. The best example is image analysis and image postprocessing , that somehow give a new way to look at filtering stochastic differential equation in a more art like way. For example rescaled foerstner operators can produce like in my diploma thesis , van gogh like pictures after postprocessing images with it.