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According to this website it's all about humility. Lots of interesting stuff here about deliberate mistakes, devotion, 'atomism' and symbolism in Kilim rugs.In a Kilim rug, the errors can range from nearly invisible to easily spotted. One source even says that the errors included are the same for a particular weaver- sort of like a maker's mark.
If you want to read about 'hoo doo blocks' or 'humility blocks' in American quilts check out this blog. The purposeful errors that are included in these wonderful works are pretty hard to spot unless you are really looking for them.
Much of this seems to be traced back to the character of Arachne in Greek mythology, who made a perfect weaving on a topic which didn't please Athena, eventually leading to her being turned into a spider (and who really wants to be turned into a spider?)
So that is your lesson on imperfection from me. I suppose I'd have to say I am most like the Amish, believing that it would be an arrogance to think I could ever make anything that is perfect. So here's my guarantee- no bead that I make will ever be perfect. I couldn't make it perfect if I had to. It might contain a little bubble, a color that didn't really work out right, or some other bit of oddness that I couldn't fix. And that is the real beauty of handmade....