A person wants to know the reason for everything, to get to the bottom of it, to explain the incomprehensible. Tim and Jane also wanted to understand what was happening to Tim, what disease was causing him to walk. Quitting things, interrupting a thought mid-sentence, walking through the snow or the scorching sun until the strength is exhausted. And then only to believe that he will fall asleep in a safe place and then be able to return home. The disease retreats and returns, the doctors throw up their hands, and Tim and Jane tear away the happy hours, days, months of remission.