Terry Pratchett‘There are ways - extremely honourable ways - of assuring confidentiality and avoiding conflicts of interest, my lord,’ said Mr Slant.
‘Ah, this would be . . . what is it now . . . the glass ceiling?’ said Lord Vetinari brightly.
‘No, my lord. That is something else. I believe you may be thinking about the “Agatean Wall”,’ said Mr Slant smoothly. ‘This carefully and successfully ensures that there will be no breach of confidentiality should, for example, one part of an organization come into possession of privileged information which could conceivably be used by another department for unethical gain.’
‘This is fascinating! How does it work, exactly?’ said Vetinari.
‘People agree not to do it,’ said Mr Slant.
‘I’m sorry? I thought you said there is a wall—’ said Vetinari.
‘That’s just a name, my lord. For agreeing not to do it.’
‘Ah? And they do? How wonderful. Even though in this case the invisible wall must pass through the middle of their brains?’
‘We have a Code of Conduct, you know!’ said a voice.