A 250 guilder note.
Robert Deodaat Emile Oxenaar, aka “Ootje”, was responsible for the design of the Netherlands’ guilders before they were swept aside by Euro blandness in 2002. In an interview with Creative Review he describes how he managed to hide secret references and little jokes in the designs, successfully evading the magnifying-glass scrutiny of the nation’s banking officials. Great designs they are as well, the audacity of a lighthouse on its side would never pass the watchdogs at the Royal Mint if someone tried that here.
Via Design Observer.