The heading really sums up all I have to say well: The enduring gift of art (for the viewer / reader) is Mindfulness - it renews your senses, emotions, lights up your inner world like a sun, makes the sun and moon of the outer world brighter, the colors and shapes sharper.
Mindfulness: Art knocks you back to your senses, you pay attention to your surroundings again. As I said in an earlier post, Attention on the Object is the act of loving the object - you re-fall in love with the world again, like a child.
Who does not wish to fully inhabit themselves and their world, to completely enjoy every aspect of a day, a sandwich, a kiss, a sunset, a bird's song? You never want to feel you're missing out on something.
This is one function of art, a tool on a par (in man's kit) with the spear and the wheel; another form of Prometheus's bestowal, the flame of our inner fires!