The sounds of higher learning

Sitting in a classroom in University of Houston Downtown, learning about Plain English at an academic forum.
The train runs by the campus, and you can hear and feel the rumble, and the whistles and bells as it approaches the stop.
The air conditioning whispers quietly, and the shuffling of papers, and sliding of chairs and coughing, and a cell phone rattles on a table.
Another train rumbles by, and students talk to each other as they walk in the hall outside the conference room.
Oh, and the presenter. He’s speaking. Saying something.
I should pay attention to him.