“It's not me but the world that's deranged. Yes, that settles it. At some point in time, the world I knew either vanished or withdrew, and another world came to take its place. Like the switching of a track. In other words, my mind, here and now belongs to the world that was, but the world itself has already changed into something else. So far, the actual changes carried out in that process are limited in number. Most of the new world has been retained from the world I knew, which is why the changes have presented (virtually) no impediments to my daily life - so far. But the changes that have already taken place will almost certainly create other, greater, differences around me as time goes by. Those differences will expand little by little and will, in some cases, destroy the logicality of the actions I take. They could well cause me to commit errors that are - for me - literally fatal. Parallel worlds.”