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I'm hoping you will finally reveal (1) why my "impossible stairway" is half
of an arch, and (2) why the location of its CG is not crucial. Surely, if
the CG of each group of blocks extends beyond the edge of the supporting
block the entire stack will fall.
It's part of the correct statement of the problem which was omitted in
the version you wrote down (and which was originally given to me). When
I first heard the problem I thought that I was being kidded.