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On Material World, on Radio 4, they mendioned a trick for revealing subtle surface detail in an object. Multiple pictures are combined, each taken with a different, highly oblique, light source to maximise shadow.

I was playing round with that last night instead of working. I can't say it's actually worked very well, at least not as well as I expected, but the picture is interesting.

And yes, I am the kind of person who has a George III Cartwheel twopence lying about. :-/

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