It's show time.
"Please try to limit all other background noise, like your cellphone should be muted."
This is a virtual classroom, and that's the stage manager giving last-minute instructions to students. This is unlike any virtual classroom you've probably ever imagined. Behind the scenes, in a control room upstairs, a producer calls the camera shots.
"Stay with him. I'm going to four. Take six."
The Harvard Business School has rented this television studio from WGBH in Boston, and transformed it into a sleek online classroom.