Photo 1: “World’s Smallest Klein Bottle” by Kiva Ford: http://www.etsy.com/listing/66353455/worlds-smallest-klein-bottle?ref=listing_67322253  (also sold as earrings, necklaces, etc.)

Photo 2: Baby Klein bottle, by Acme Klein Bottles, “our universe’s foremost supplier of immersed, boundary-free, nonorientable, one-sided surfaces”:  http://www.kleinbottle.com/classicalklein.htm

http://en.wikipedia.org/wiki/Klein_bottle

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