Manchester: I have just been on the set of tonight's prime ministerial debate.
What strikes you instantly is how close the three men will be standing to each other. David Cameron and Gordon Brown are literally within touching distance - which mean that if one of them wants to turn to address the other, they'll have to be happy invading some personal space.
I suspect that for much of this debate the leaders will prefer to stare down the lens and speak directly to those watching in their sitting rooms. But as and when they do decide to confront each other, they might find themselves standing uncomfortably close.
In addition, David Cameron - who got what some regarded as the "best spot" in the centre of the three lecterns - will find himself having to move his head from side to side as if watching a ping-pong match if Nick Clegg and Gordon Brown gang up on him.
This has left some advisers feeling decidedly queasy.