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Just over six months ago, illustrator Nathan Pyle let us in on a little secret. Turns out there's an underground passageway between 30 Rock and a nearby Chipotle. This proved invaluable for office workers during the winter. Seemingly overnight, Pyle became an Internet sensation and unofficial expert for all things New York. So, it only makes sense that he's expanding his talents to help out-of-towners survive in the Big Apple. His new book, NYC Basic Tips And Etiquette, offers hundreds of unofficial rules and reminders for those visiting. Among them, you'll find tipping protocols, taxi-hailing techniques, and the ever important laws of sidewalk traffic. Ahead, Pyle shares a few of his most useful (and hilarious) illustrations. (We're especially fond of his umbrella advice.)