Nick Clegg looks ahead, while the other two are more concerned with what’s going in the studio.
It speaks volumes as to how the three leaders approached last night’s debate.
Did you find Clegg's approach of speaking directly into the camera to be effective? I (as an admittedly partisan observer) found it really weird and offputting, but I can see that it could help to raise him above the other two engaging with each other and the studio, so that he looks straight-talking and aloof while they look like they're squabbling.
Frank Luntz, who knows a thing or two about these things, said he was right to do.