I think variety - elegant or otherwise - should probably be one's default, though. Repeating the same effect is a high-risk strategy, which I guess Haddon is a good enough writer to pull off. But you only have to read a few wannabe Hemingways (i.e. most of the blokes on any creative writing course
) to realise that it's much, much harder to get right than it appears to be.
Emma
<Added>Pete - realise we're saying much the same thing...