You physically place the departments in the air for the audience to reference. As you say the word marketing , your right hand places the word in the air to your right. As you say sales , your left hand places the word in the air to your left. The three departments are now floating in virtual space and you can immediately reference any of the three by physically retrieving it from its floating position. Until you move your body, the audience remembers where you placed these references because they have been given points to reference.
Focal points have a near or far nature, similar to a camera lens.
If the focal point is closer to you, the background blurs. If the focal point is more distant, the foreground blurs. You can try this by holding your index finger up in the air at arm s length, about the height of your eyes. Look only at your finger. Notice that everything behind your finger is blurry.