On Tue, 05 Sep 2006 10:08:31 +0100, wrote:

pages that have straight sides were not parallel.

Interesting. The glasses presumably were correcting for a problem that
your mind had already corrected for.

I read long ago that if you wear lenses that invert the world, after a
few days it will turn right-side-up. Then, when you take the lenses
off, the world appears upside-down.

I surely had a lot of trouble learning to land the Cub. Could it have
been the glasses?