He looked at me harshly, then his eyes softened. He rotated the paper, gazed at it for a moment, and began to scrawl, numbers and circles and great, arcing lines that doubled back on themselves. His solution didn’t look like anything in my textbook. It didn’t look like anything I had ever seen. His mustache twitched; he mumbled. Then he stopped scribbling, looked up and gave the correct answer.
