For her degree from the Glasgow School of Art, Harriet Russell decided to do a little postal experiment to find out exactly how far would the men and women at Royal Mail were willing to go to deliver mail:
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.