Snapchat's AR studio has created three experiences to celebrate the 10th anniversary of said seminal record. First, there's an AR lens already out today for fans to listen to Horizon – a track originally only released as a bonus track on the Japanese version of the album. Secondly, an AR treasure hunt kicked off yesterday, with fans in 10 cities (including London) able to visit physical locations – discovered using clues posted on social media – to unlock another lens. Finally, there will be billboard posters in seven cities (Paris, New York, LA, Mexico City, Sydney, London, Liverpool and Berlin) with a new 'crystal helmet' to play with in AR using Snapchat. Very cool!