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Animation of a half-turn ambigram of the word ambigram, with 180-degree rotational symmetry [1]. An ambigram is a calligraphic composition of glyphs (letters, numbers, symbols or other shapes) that can yield different meanings depending on the orientation of observation.
In 1992, Three Rivers Press published Wordplay, Langdon's first book about ambigrams. Each ambigram was accompanied by a philosophical essay. [16] [10] [1] [4] [13] Math professor Dick Brown contacted him with questions about his craft and also asked if he would be interested in designing a cover for his son Dan's new album, Angels and Demons.
A half-turn may refer to: One half of a full turn, an angle measure equivalent to 180 degrees or π radians Considering only points in a plane, a half turn is equivalent to a point reflection; Pi (π), a mathematical constant representing a half-turn in radians; A U-turn: a driving maneuver used to reverse direction
An example of Langdon's ambigrams appeared on the cover of the first edition of Brown's novel Angels & Demons, and other ambigrams featured throughout that novel were also designed by Langdon. On the acknowledgments page, Brown calls Langdon "one of the most ingenious and gifted artists alive … who rose brilliantly to my impossible challenge ...
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