Joel Hagstrom- Van Der Leeuw's View of Art and Religion

In Sacred and Profane Beauty, by Gerardus Van Der Leeuw, the ideas of religion and art are explored.  Van Der Leeuw says that, "there is no actual contrast" between religion and art with the primitive man because "the primitive man sees concentric circles" while the modern day man sees "a series of neatly separated planes."  I would have to agree with Van Der Leeuw because in society today everything (art and religion) has its own specific explanation that separates it into different entities.  Compared to the primitive man that would have combined aspects of art and religion into his or her everyday life as part of the norm.  Ancient cave paintings offer evidence into the wholeness experienced by primitive man.  The paintings are an act of ritual that help tie together different parts of primitive culture, instead of compartmentalizing it like that of today's culture.  By keeping religion and art as integral parts in one's everyday life the "concentric circles" are created instead of the "separated planes."  When did the concentric circles begin to be separated?  Was it a gradual progress or was it sudden?  Is there any way to overlap the planes to get back to the ways of the primitive man?