When you 'tap in' from the home screen, you enter the meditation room and an orb floats from the center of the screen outwards. Ambient music plays. As far as I can tell, each orb represents another person who is is the room, waiting for the session to begin. As the timer counts down and the session starts, the instructor begins to talk and you can see the timer on the top.
If you want to dismiss the graphics, you can swipe to see the instruction screen.