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Enigma
noun [enig·ma \i-ˈnig-mə, e-\]
: someone or something that is difficult to understand or explain
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You'll find the tissue in the lower and upper right-hand corners--it's stamped with text. I didn't wrinkle it like Tim did so you can't really tell where it is but that's why it's useful in collage pieces (because it blends in so well).