Having finished this, I must say it's not really what I expected. I thought it would simply be a collection of artistic ambigrams (words drawn so that they can be read the same way upside down). Instead, I would almost call it a philosophy book illustrated by ambigrams.
The book consists of numerous brief (1 to 2 page) essays on words such as philosophy, polarity, astronomy, magnetism, etc., and their dual meanings in our language. The idea of yin-yang, and Taoism, runs strongly throughout the book.
It isn't strictly a philosophy or Taoist book, but it's more than a collection of ambigrams, too. I found it quite interesting, and looking at the artistically drawn words was both mind-boggling and intriguing!
A Christmas gift from my aunt; looks quite different and interesting!