Last month I went on a walk with my friend Ezra. It was his birthday, so we walked for almost two hours, drinking coffee, eating cinnamon rolls, and talking about semantics and coding. The funny thing is that Ezra lives on the West Coast and I live in New York, so we conducted our entire conversation by cell phone, with him walking through Ballard and Loyal Heights, and me walking through Jackson Heights and East Elmhurst.