Or that by the time the light has reflected off the walls of the universe and reached us here on Earth, it's dispersed so much that it is carrying practically no energy and just cannot be detected. Or, even better, since the Universe is expanding at or faster than the speed of light, the light can never actually reach the walls to bounce off.
And re: rods. I was stunned when I first saw the program on telly about them, but after reading a very down-to-earth evaluation of them I decided to stop being so impressed, since those effects could so easily have been created by insects reflecting light. I forget the page, but it puts up a damned good arguement.
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