She spent some time going through the Duke's books. Most of them were 
notebooks where he would sketch the inventions he hadn't had time to build yet. 
He had plans for whole armies of Turing machines made to run in parallel, and 
for chains with links that could be set in more than two positions, and
for machines that would read and write on two-dimensional sheets of chain mail 
instead of one-dimensional chains, and for a three-dimensional Turing grid a 
mile on a side, through which a mobile Turing machine would climb about, 
computing as it went.