In my experience, "chaotic" art isn't chaotic at all. Really, it's artistic. Modern art is up for any interpretation. Take for example a Jackson Pollock painting (essentially paint splatter) (like so):
While it may look chaotic to the untrained eye, some may turn the shapes and colors into something meaningful to them.
Another by Kandinsky:
Kandinsky was a color theorist and played with which colors created different feelings/judgements. Also, he mainly uses geometric shapes, and while they seem to be laid down on the paper randomly, one shape leads your eye to another line to another shape to a grid to a line and so on... Your eye remains on the paper while you look around at what the heck is going on.
Also sometimes, it's more the process than the product.