Cow has it right, its just the same as the idea of trapping sound or creating perpetual motion. Light is created by a reaction that has a certain force. Once the force is diffused it is no longer light but rather the remnants of it.
If you want something interesting, read up on quantum theory. at any time there is an infintesimal chance that a carrot riding a bicycle will pop into your room, or you could teleport to another dimension. Also quantum theory states that light even if you could keep it at full power within the box would eventually escape through the same ways. *we are talking 10 to the nth power chance though*
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"How soft your fields so green, Can whisper tales of gore"
"Thou art god"
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