Angels & demons - Brown, Dan (London : Corgi Books, 2016. ©2000, 2016)
The book contains several ambigrams created by real-life typographer John Langdon. The book contains ambigrams of the words Earth, Air, Fire, and Water, which has served to bring the art of ambigrams to public attention by virtue of the popularity of the book. The Illuminati Diamond mentioned in the book is an ambigram of the four elements arranged in the shape of a diamond
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Keywords: Cryptographers -- Fiction; Langdon, Robert -- (Fictitious character) -- Fiction; Suspense fiction