Different Idea.

It seems Lewis has found a different idea to the rest of the field, and well... He and the team have gone and done this

4 Mirrors on a F1 Car? I've never seen it done before :P 

Is that really legal????? That seems weird!!!! How to concentrate with two eyes on 4 mirrors??The_Gabmaster

 Might be for aerodynamics advantage and offer 'better' eyesights for the drivers.:)

They're to make doubly sure that Alonso is behind him.KimisApprentice

Does it add weight or somethin'?

"McLaren ran a four-mirror set-up at the Sepang test in April, so that their drivers could compare the Renault/Ferrari-style wide-apart positioning (better for aero) with a more conventional close-in set-up"

SOURCE: F1 Racing Magazine May 2007, page 33