One pack contains 16 different embossed cards  
 
  "Letter's Vignette" frottage cards
© D-BROS 2007
Letter's Vignettes are cards embossed with various drawings. Putting one under a sheet of paper, and frotting the paper with a pencil reveals the card drawing.
I proposed this idea while doing an internship in Tokyo, at DRAFT agency. It is now being produced, and sold in Japan. There are various drawings collections, this one is mine.
More here, here, here ...
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