When she had the organ working properly and the residents cheered up, she 
moved on to a castle that functioned according to rules written in a great 
book, in a peculiar language. Some pages of the book had been ripped out by the 
mysterious dark knight, and Princess Nell had to reconstruct them, learning the 
language, which was extremely pithy and made heavy use of parentheses. Along 
the way, she proved what was a foregone conclusion, namely, that the system for 
processing this language was essentially a more complex version of the 
mechanical organ, hence a Turing machine in essence.