Celebrity There’s A Hidden Shelf Behind NPR’s Tiny Desk Concerts…And The Items Artists Leave Behind Are Actually So Random Might be the most valuable bookshelf in history… If you've never watched an NPR Tiny Desk concert , it's basically exactly what it sounds like — artists performing live in a tiny office space, completely stripped down and raw. It has this way of spotlighting new talent or humbling some of the world's biggest artists, showing a much more intimate side of their artistry than a normal show ever could. But there's one detail most people miss: every artist who performs there has to leave something behind. 1. Taylor Swift left a signed CD behind at Tiny Desk, and it's the only item from the shelf that's ever been stolen. 9. Post Malone left behind his cowboy boots , which perfectly encapsulate his new aesthetic. 15. Joe Jonas left a takeout box with "Happy Birthday Joe! (Jonas) NPR loves you!" written on it. 17. Yo Gabba Gabba!…