The Inside-Out Nature of Painting

I lived briefly in Australia with my husband and sons in the late 1990's. While there, I was surrounded with Aboriginal art and was taken in by the freedom of the forms, and particularly a style called "X-Ray" by certain tribes from the North of Australia.  This is a 4000 year old technique in which the inner parts of animals and humans are painted within the silhouette of the figure, often lined with white pigment.  The figures are sometimes secular and other times sacred depictions of supernatural beings.  It was attractive to me for the way it described things unseen as well as for it's bold and direct aesthetic.