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I think you're probably right, cliche. Maybe we should consider the local speed of light, ie taking the material of the cube as the medium. However, since the square is immaterial, we can safely model it as being made of vacuum.
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"No one was behaving from very Buddhist motives. Then, thought Pigsy, he was hardly a Buddha, nor was he a monkey. Presently, he was a pig spirit changed into a little girl pretending to be a little boy to be offered to a water monster. It was all very simple to a pig spirit."
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