For 20 seconds he's going like that, and all of a sudden it lights up up here.

You saw the light under the door and hid behind the curtains.

Watch the camera. When the red light is on, you're on.

When the phone rings, you'll see the light go on under her bedroom door.

And you can see how the little math processor is working up here in his brain and is lighting up the whole brain.

To assist speakers in managing their time, a light system has been installed at the rostrum, which functions as follows. A green light will be activated at the start, an orange light will be activated 30 seconds before the end of the four minutes and a red light will be activated when the four minute limit has elapsed.