I’ll know it when I see it. That was Jobs’s credo, and until he saw it his perfectionism kept him on edge. He looked at the title bars—the headers that run across the top of windows and documents—that his team of software developers had designed for the original Macintosh and decided he didn’t like them. He forced the developers to do another version, and then another, about twenty iterations in all, insisting on one tiny tweak after another, and when the developers protested that they had better things to do he shouted, “Can you imagine looking at that every day? It’s not just a little thing. It’s something we have to do right.”
Malcolm Gladwell, "The Tweaker: The real genius of Steve Jobs," The New Yorker, 14 Nov 2011, www.newyorker.com/reporting/2011/11/14/111114fa_fact_gladwell,
via Sam Grigg.