Deliberate Imperfection

As a boy I learned that the creators of Navajo blankets purposely weave a flaw into each of their creations

(from metacool). This reminds me of a Persian Flaw. The legend goes that back in the day (though I'm not sure what day it was), Persian rug makers were deeply religious and believed that only God could make something perfect. Therefore, in their humility before God, they would deliberately incorporate a small error, a flaw, into each rug. Thus a Persian Flaw revealed the rug maker's devotion to God. I imagine the rug buyer could/might share this sentiment. It also works as a hat tip to how we are all human and imperfect.