On Mon, 24 Nov 2003 23:32:21 +0000, "Ed Sirett"
wrote:


I can't think where I found out that it was a 'should' rather than an
'is', but I beleive it to be so, but welcome to be corrected.

I was told it was so that blind people would know which was which. I
don't know how they are supposed to know if it has been plumbed
incorrectly though....