We expect a deep thinker like Martin Buber to have a deep definition of art:
Art . . . is the realm of “between” which has become a form. Consider great nude sculptures of the ages: none of them is to be understood properly either from the givenness of the human body or from the will to expression of an inner state, but solely from the relational event which takes place between two entities which have gone apart from one another, the withdrawn “body” and the withdrawing “soul.”
(Quoted from page 63 of Martin Buber: On Intersubjectivity and Cultural Creativity, by Martin Buber. The University of Chicago Press, 1992.)
For a brief biography of Martin Buber, click here. For images of or relating to Martin Buber, click here.