With two years until the next general election in 2015, Mr Cameron sought to draw battle lines between his party and Labour.

BBC: David Cameron urges Welsh Tories to fight 'battle of ideas'

This seems to have led him to divide almost everybody into friends and foes, and to draw rigid lines between good and evil in virtually all matters, commercial as well as moral.

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But candidates may still have to bang-the-drum for these elections, even before they can draw up political lines between their rivals.

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Many MPs want a new Parliamentary Privilege Bill to sort these issues out - to draw clear lines in the sand between the courts and Parliament and set out what the rules should be for the media, too.

BBC: Parliamentary privilege, MPs and super-injunctions

In ancient Greece, merchants would draw lines on the ground and place pebbles between them.

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As work merges with life and life with work, it is more important than ever for employers to draw clear work-life boundaries and for employees to resist the temptation to blur the lines between their work and private lives.

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