Re: Arthur C. Clarke's "The Wall of Darkness" - what's the point?

> I believe the implication is that the wall was built over the
>klein bottle twist in their world. Without the wall, that twist
>would be visible. That explains why seeing it, without the wall,
>might drive people mad.

Ok, that might explain it then. I was trying to figure out where on the strip that great wall would have been.