200ton TNT is an audiovisual project that utilises the augmented reality (AR) possibilities of smartphones and tablets. Poet and philosopher Maarten Doorman made 7 letter poems that are shown at the well-known TNT mailbox. These poems are designed and animated by Nils Mühlenbruch and P.J. Roggeband in the 200t TNT app, which is available for free in the app store.
(Source: Translation from description on YouTube)