When I think of Apple, I visualize elegant design. Mention Google, and my first thought is innovation. Talk about Zappos, and my mind immediately thinks of CEO Tony Hsieh’s metaphor “Delivering Happiness.” These three iconic brands clearly know what they stand for and their greatest market differentiator is their relentless pursuit of delivering on their promise. Design and brand maven, Debbie Millman engages 22 of the most progressive voices in design to share their perspective on Brand Thinking — Here’s a glimpse…