Klatergoud (fools gold) a book written in the Dutch language. It contains optical illusions visible through use of a transparent sheet printed with horizontal black stripes. A novel about polarity. A murder, a mystery and what it all comes down to in the end. The book can be downloaded as ebook from amazon. Click below.

https://www.amazon.com/Klatergoud-Dutch-Ray-Jo%C3%ABl-ebook/dp/B01KKGQTUS/ref=sr_1_1?ie=UTF8&qid=1538302121&sr=8-1&keywords=klatergoud

Here you can view one of the many optical illusions that are in the book: