Finkbuilt has a cool article up that shows a lithophane being created. One of these days I would like to put the Fireball V90 through its paces and also make one of these.
"Lithophanes were a popular way to hide girlie pictures in the bottom a of gentleman’s tea cup around the end of the 19th century. An image would be molded into the porcelain in the cup so that only when held up to a light would the picture be visible."
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I saw this post, and it reminded me of a sample that a vendor handed out at a demo for some CNC software. The piece was carved out of plastic and the thicker parts end of being darker when you hold up the piece to the light. It’s truly an amazing piece of work.
The names on the sample are
ArtCAMPro
Art Emboss
Delcam plc
links to some photos I took today–
http://farm4.static.flickr.com/3460/3842055845_9b4a8fee88.jpg
http://farm3.static.flickr.com/2583/3842846794_775c766946.jpg
http://farm4.static.flickr.com/3551/3842055925_090ff63a00.jpg