I want to render two sheets of paper (one on top of another).
See e.g. the following images:
http://3.bp.blogspot.com/-Z_xcZG_0OpM/T6QQOa_85RI/AAAAAAAAY2Y/SfjXLhylBc8/s1600/IMG_5882.JPG
https://t2.ftcdn.net/jpg/00/67/30/75/240_F_67307554_13kmP5SBUF36d3HrbcR6O0swgZcv3Hhu.jpg

I want to get this tiny shadow which is formed by the topmost sheet on the
bottom one.
Since the distance between the sheets is VERY small, I cannot just place two
meshes with different z-coordinates.

I thought of using some multilayered texture:
1. bottom sheet
2. some shadow layer (???)
3. top sheet

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