Tossing

18 May 1999

...
 > The way to build a wall is to stack them not all
the same way round.  The most
...
 > stable method is probably LRRLLRRLL..., but LRLRLR
would probably work (L and R
...
   meaning Macs
facing Left and Right respectively) 
 LLRR wouldn't work.  You'd have an unstable zigzag. LRLR is far more
 optimal. 

LLRR definitely wouldn't work.  But LRLR will still tend to stray from the
vertical because the sloping tops all slope the same way.  That is why I
suggested LRRL.  This zigzag reverses the sideways displacement that occurs in
each pair of layers, thus rising vertically and being therefore more stable than
LRLR.

Philip.

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Tossing