It has been a very long time since I've been able to concentrate on a book.
The Housekeeper and The Professor

The Professor never really seemed to care whether we figured out the right answer to a problem.He preferred our wild, desperate guesses to silence.and he was even more delighted when those guesses led to new problems that took us beyond the original one. He had a special feeling for what he called the 'correct miscalculation,' for he believed that mistakes were often as revealing as the right answers.

...he would sit peering in as the toast browned. He was as fascinated by the toast as he was by the mathematical proofs we did together, as if the truth of the toaster were no different from that of the Pythagorean theorem.