I saw a Cage lithopane but the image hadn't been inverted before being produced, so the finished article was a negative of the picture - I inverted it and this was the result.

Best printed at 0.2mm layer height

Customized version of http://www.thingiverse.com/thing:74322

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=74322