theswindlr: Prepare to waste at least 3 mins trying to figure this thing out. It is called the &ldqu
theswindlr:Prepare to waste at least 3 mins trying to figure this thing out. It is called the “Klein Bottle” and has no inside nor outside surface, what is more you can actually fill these with fluid.Here’s how -- source link
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#klein bottle#bottle#design#product design#shape