Sigh...

I was reading a very good book on software user documentation, Edmond H. Weiss's 'How to write Usable User Document'. In it, I came across the following passage:

'If documents are printed on two sides, be sure that the paper is heavy enough so that the characters and graphics do not "bleed through" the back.'

I looked more closely at the book I was reading. And sure enough, I could clearly see the text on the other side of the page; well enough to read it, in fact.

Yet another manifestation of the Law of Inaccurasy.