The problem with the valley was this. The Monk currently believed that the valley and everything in the valley and around it, including the Monk itself and the Monk's horse, was a uniform shade of pale pink. This made for a certain difficulty in distinguishing any one thing from any other thing, and therefore made doing anything or going anywhere impossible, or at least difficult and dangerous. Hence the immobility of the Monk and the boredom of the horse, which had had to put up with a lot of silly things in its time but was secretly of the opinion that this was one of the silliest.