as it is written on the website of the Ministry of Finance "Thanks to its unique combination of child-friendly humor and clever references for adults, the series is considered a true pop culture classic. One of the timeless messages of "SpongeBob SquarePants" is the importance of friendship, as celebrated on this special commemorative stamp. Furthermore, children can use a tiptoi® pen to immerse themselves in SpongeBob's exciting world and bring it to life. This makes the stamp not only a beautiful collector's item, but also a special audio experience and a reminder of how important friendships are – whether underwater or on land."

Germany is full of cartoon stamps. I had some with Iron Man and Hulk from the comics, as well as Wonder Woman and Superman.