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"There's nothing like replacing a mundane trip to the store with a DIY endeavor, and creating a simple conversation piece that still serves a purpose just makes it all worthwhile. The latest geekish creation to come our way is the photomask coaster, which essentially utilizes \"clear templates used in semiconductor manufacturing\" to keep condensation from ruining your furniture. Better still, you can apparently locate unwanted versions of these things at certain electronics surplus stores, and considering that most feature different patterns within, you can create a whole set of coasters that each sport their own unique identity. We know, we just got way too Home &amp;amp; Garden for some of you to handle, but you'll survive.[Thanks, Chris]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/08/19/spare-photomasks-used-to-create-coaster-set/>