“Albert Einstein put it this way: I take time to go for long walks on the beach so that I can listen to what is going on inside my head. If my work isn’t going well, I lie down in the middle of a workday and gaze at the ceiling while I listen and visualize what goes on in my imagination. Mozart felt the same way: When I am traveling in a carriage or walking after a good meal or during the night when I cannot sleep—it is on such occasions that my ideas flow best and most abundantly.”