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(17 May 2009 17:02 GMT) - All those symbols flashing in Web site promos and posters promoting Ron Howard's new film 'Angels and Demons,' based on the novel by Dan Brown, were created by a professor of typography at Drexel University. John Langdon, who, not by coincidence, shares the same last name as the film's protagonist played by Tom Hanks, has been creating ambigrams - words that can be read from left to right, upside down or from multiple viewpoints - since the 1970s. The follow up to the international blockbuster 'The DaVinci Code' features Langdon's ambigrams, which were first seen by the public in Brown's novel, Angels and Demons, published in 2000…
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