Wacky, what I "think" he is trying to say is that because the balls do not fit tightly into the base of the box, when the second layer is put on top the balls on the bottom layer move apart a little bit. This would mean that the tetrahedrons (if that's the right shape) are not as tall as Wblipp's maths would indicate. This process is repeated with each subsequent layer.
I'm not saying he's right, I am only interpreting what he said.
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