I think I missed the point? the whole world uses it? uses waht? what is an earthbulb? Not so sure this is popart...but then again...who knows..it might be...smile..
I thought the "60 W" combined with the title was a bit of a give away myself... then again, it does require looking, I suppose. (I speak as somebody who can - almost - never see what I'm "supposed" to).
Neat idea and reasonably effective, though it would be nice if it was more lightbulbish in shape. With the new EU legislation that should allegedly become a more difficult task of course - good thing that was long after this contest!