Talk about cryptic codes. Strange black-and-white boxes—with monster, checkerboard patterns—are popping up on billboards and tourist signs across the U.S.
The codes are even more common in England, appearing in subway ads and magazine articles. The most playful example I've seen has been at Rosa's, an excellent Thai restaurant in London's Soho neighborhood, where every server wears a T-shirt with a QR code printed on the back. QR codes: What travelers need to know - Budget Travel
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