Thought Experiment: Imagine you have a box, and the inside is all reflective mirrors or perfectly white and you put a beam of light in there, and then seal it up tight (maybe a disco ball, so you can bounce a beam in, and as the light bounces around, you -speedy that you are- have a chance to seal the portal).
How many days later could you peak into the box and it would still be lit up?
Deep Thought: If a box is sealed, and no one can see in it, is it dark inside? Maybe not!
jlw5Sept11