\7~-RAY ART can be considered as one of the many techniques employed by artists ^^* to supplement human vision. It is fairly common in the world of art to show more than one would normally see under the conditions that are supposed to apply. Any art involves selection, and interpretation on the part of the artist and observer, of elements that are considered important. To the uninitiated or the unsympathetic such apparent distortion and rearrangement of component parts may be incomprehensible. For, as well as choosing from elements that are naturally visible, the artist may go further. He may choose to portray elements which he knows to exist, but according to the laws of optics are not visible from his chosen viewpoint. In Greek art, such techniques range from the naive representation of all the legs and heads of a profile four-horse chariot team in the archaic period, to the use of modelling lines, and other devices in the portrayal of drapery, to give a threedimensional or transparent effect to late fifth century sculpture. The profile head in combination with frontal chest had a long history in Egyptian and Greek art ; and in Christian art the halo and aureole add a sort of spiritual dimension to Christ, apostles and angels. Such techniques, once acquired, tend to become conventional, and persist, perhaps for hundreds of years, until fashion changes. There is no reason to suppose that the Australian Aboriginal artist was any less conservative or any less affected by the restrictions imposed by convention. Australian X-ray art in particular appears to have had a fairly long history in a reasonably restricted area.1 The style once invented obviously gained acceptance, and became as conventional as geometric, black figure or red figure in Greek vase painting. It seems to me that style, fashion and convention are of paramount importance in the persistence and perpetuation of the X-ray art style. Theories on the origin of the style can only be speculative, but this has not prevented people from looking for clues. The simple explanation art for art's sake is not a popular interpretation of the driving force behind primitive art, though it has been suggested, amongst other motives,2 for some Australian aboriginal art.
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