X is for X-ray

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For my X post I found some art which is thousands of years old, from the very origins of human creativity. The picture is an Aboriginal rock painting that shows a turtle and is an example of what has become known as 'X-ray art', because pictures would be made that showed the internal structure, bones and organs, of animals and people. It is a style that is still used today by commercial artists. (There is more interesting stuff about the religious and cultural symbolism in Aboriginal art on the Wikipedia page)

(Linking back to the A to Z challenge)