An article about Lithophanes.
http://www.carvewright.com/assets/tips/CarveWrightTips_and_Tricks_J...
http://www.carvewright.com/assets/tips/CarveWrightTips_and_Tricks_J...
http://www.carvewright.com/assets/tips/CarveWrightTips_and_Tricks_Jan09.pdf
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