The arts are concerned with entertainment, not knowledge.
Unlike knowledge in other areas of knowledge, art is concerned with the individuals conceptual understanding of their own experience, rather than an understanding of the nature of the universe. Though the arts to be taken with its aesthetic value in mind, the arts main focus is not concerning others interpretation or appreciation of the piece, but to express and convince oneself of observations and understandings of the universe. Shared knowledge in the arts is also very unique because the knowledge that is recieved from a painting is different for each individual and different over time, the understanding that conveyed by the artist could be entirely different to the one received. Though this is the case, the knowledge from an artwork is still valuable as the accumulated understandings of each artist help us gain a deeper understanding of our universe and ourselves.