How solid and how clear it is depends on how much air is in it and how fast it cools - Fast freezing ice cubes (31 degrees and that area) would be brittle and airy, like most of your ice machines that are apart of your fridge.
An old school ice machine probably freezes them at much lower temperatures and the water that it freezes it in is probably all connected so that no air can get into the machine where the water is (unlike one you would find in a freezer that's in a fridge)
Just a guess, though
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I got in a fight one time with a really big guy, and he said, "I'm going to mop the floor with your face." I said, "You'll be sorry." He said, "Oh, yeah? Why?" I said, "Well, you won't be able to get into the corners very well."
Emo Philips
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