What is the most interesting abstract art work. (Just an opinion)

  

Art is alive when it first crashes on the art scene when critics and art world don't quite know how to respond to it.

J. M. W. Turner's Rain, Stream and Speed (1844)

Turner was exiled by the academy in 1838. This is one of his earliest attempts to capture his era and experience in a new style. One could make an argument that the above painting is one of the first impressionistic works. The hues and the technique of applying paint had to be rethought. This painting was a game changer.