Coloring-in books are becoming more and more popular among adults. However, there's a new alternative that's arguably even cooler and more fun. The scratchboard-type product allows you to illuminate various famous skylines from around the world, simply by scratching away with a fountain-pen inspired stylus. 'Scratch Night View' is the product's name, and it is designed by South Korean company 'Lago'. The board sells for about $16, but a smaller version is available for approximately $13. Eight different skylines are available… New York, Hong Kong, Las Vegas, London, Paris, Hamburg, Florence and Budapest. You can buy the product on Etsy or Amazon. Take a look!