Suddenly my mind was clear like a crystal. From one second to the next I felt like I could penetrate any mystery of the world and solve it. That of course is an illusion, but I felt an enthusiasm for intellectual challenges that I had missed in the days and hours preceding this moment. It started with a post I wrote, the one about Franz Schubert’s Piano Sonata No. 20 in A major. I felt energized, wide awake even though it was just past midnight.