In his Christmas message, Mr Cameron said he hoped for an election "free from fake political dividing lines".

BBC: Lib Dems deny Cameron claim of Tory 'similarities'

Then, to judge whether people build languages around what their brains are best attuned to, he compared these theoretically best divisions with real-world dividing lines.

ECONOMIST: Psychology

The prime minister's strengths were his usual ones: a good command of detail and a flair for creating dividing lines with Mr Cameron, especially on public spending.

ECONOMIST: The daily take

These stark realities have prompted some would-be mediators to worry less about Kosovo's long-term constitutional status and to focus instead on the short-term goal of securing a ceasefire, ideally with dividing lines clear enough for peacekeepers to monitor.

ECONOMIST: Kosovo��s darkening skies

The business of issuing securities used to be the exclusive preserve of Wall Street firms, such as Morgan Stanley and Goldman Sachs, but during the past twenty years many of the dividing lines between ordinary banks and investment banks have vanished.

NEWYORKER: What Good Is Wall Street?

But they also point to a new cosmopolitan cesspool, where a similar set of worries beset every strata of society, uniting and dividing it along new lines.

ECONOMIST: The capital as inspiration for novelists

An aging stem cell doesn't quite have the luxury of dividing into all these cell lines.

CNN: Dr. Sanjay Gupta: Understanding stem cell research

Martell said corporates usually work with several banks for trade finance, often dividing their trade finance among several where they have lines of credit available.

FORBES: Citi Makes Trade Finance Easier For Corporates