The book Fishes of the Seven Seas, co-written with my wife Gel, was published in June 2023.
This book contains instructions for the 14 fish pictured below as well as fishy facts about the real-life animals.
In 2021, the book LEGO®-Loks bauen!, co-written with Gabriele Ruthsatz, was published by GeraMond-Verlag
This book contains instructions for the 7 locomotives pictured below as well as interesting information on their prototypes.