see the light is a light installation which equips eye blink detection and it only lights when people close the eyes in front of the camera.

  For lightning, you should close the eyes. If you close the eyes, you cannot see the light. So the person who see the light should be outside of the interaction. But once this person gets closer to the light to turn on, the person cannot see the light. And another person will see the light from outside in the same manner. If there are only the light and a person, the person will never see the light.