The story is told of a group of salmon fishermen who gathered in a Scottish inn after a long day of fishing. As one was describing a catch to his friends, his arm swept across the table and knocked a glass against the wall, shattering it and leaving a stain on the white plaster surface. The man apologized to the innkeeper and offered to pay for the damage, but there was nothing he could do; the wall was ruined. A man seated nearby said, “Don’t worry.” Rising, he took a painting implement from his pocket and began to sketch around…