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We may be living in the era of the email, but one young illustrator has proved that the art of correspondence is far from dead. While working for her degree at Glasgow School of Art Harriet Russell decided to find out exactly what lengths the men and women of the Royal Mail were willing to go to to ensure the safe delivery of her missives. To put them to the test she concealed the addresses of 130 letters to herself in a series of increasingly complex puzzles and ciphers. Among the disguises she employed were dot-to-dot drawings, anagrams and cartoons. The answer, it seems, was very far indeed. Amazingly, only 10 failed to complete their journey back to her.